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path: root/src/gallium/targets
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'\" t
.\"
.\" CDDL HEADER START
.\"
.\" The contents of this file are subject to the terms of the
.\" Common Development and Distribution License (the "License").
.\" You may not use this file except in compliance with the License.
.\"
.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
.\" or http://www.opensolaris.org/os/licensing.
.\" See the License for the specific language governing permissions
.\" and limitations under the License.
.\"
.\" When distributing Covered Code, include this CDDL HEADER in each
.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
.\" If applicable, add the following below this CDDL HEADER, with the
.\" fields enclosed by brackets "[]" replaced with your own identifying
.\" information: Portions Copyright [yyyy] [name of copyright owner]
.\"
.\" CDDL HEADER END
.\"
.\"
.\" Copyright (c) 2009 Sun Microsystems, Inc. All Rights Reserved.
.\" Copyright 2011 Joshua M. Clulow <josh@sysmgr.org>
.\" Copyright (c) 2011, 2016 by Delphix. All rights reserved.
.\" Copyright (c) 2014, Joyent, Inc. All rights reserved.
.\" Copyright 2012 Nexenta Systems, Inc. All Rights Reserved.
.\" Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
.\" Copyright 2016 Richard Laager. All rights reserved.
.\"
.TH zfs 8 "May 11, 2016" "ZFS pool 28, filesystem 5" "System Administration Commands"
.SH NAME
zfs \- configures ZFS file systems
.SH SYNOPSIS
.LP
.nf
\fBzfs\fR [\fB-?\fR]
.fi

.LP
.nf
\fBzfs\fR \fBcreate\fR [\fB-p\fR] [\fB-o\fR \fIproperty\fR=\fIvalue\fR] ... \fIfilesystem\fR
.fi

.LP
.nf
\fBzfs\fR \fBcreate\fR [\fB-ps\fR] [\fB-b\fR \fIblocksize\fR] [\fB-o\fR \fIproperty\fR=\fIvalue\fR] ... \fB-V\fR \fIsize\fR \fIvolume\fR
.fi

.LP
.nf
\fBzfs\fR \fBdestroy\fR [\fB-fnpRrv\fR] \fIfilesystem\fR|\fIvolume\fR
.fi

.LP
.nf
\fBzfs\fR \fBdestroy\fR [\fB-dnpRrv\fR] \fIfilesystem\fR|\fIvolume\fR@\fIsnap\fR[%\fIsnap\fR][,...]
.fi

.LP
.nf
\fBzfs\fR \fBdestroy\fR \fIfilesystem\fR|\fIvolume\fR#\fIbookmark\fR
.fi

.LP
.nf
\fBzfs\fR \fBsnapshot | snap\fR [\fB-r\fR] [\fB-o\fR \fIproperty\fR=\fIvalue\fR] ...
      \fIfilesystem@snapname\fR|\fIvolume@snapname\fR ...
.fi

.LP
.nf
\fBzfs\fR \fBrollback\fR [\fB-rRf\fR] \fIsnapshot\fR
.fi

.LP
.nf
\fBzfs\fR \fBclone\fR [\fB-p\fR] [\fB-o\fR \fIproperty\fR=\fIvalue\fR] ... \fIsnapshot\fR \fIfilesystem\fR|\fIvolume\fR
.fi

.LP
.nf
\fBzfs\fR \fBpromote\fR \fIclone-filesystem\fR
.fi

.LP
.nf
\fBzfs\fR \fBrename\fR [\fB-f\fR] \fIfilesystem\fR|\fIvolume\fR|\fIsnapshot\fR
     \fIfilesystem\fR|\fIvolume\fR|\fIsnapshot\fR
.fi

.LP
.nf
\fBzfs\fR \fBrename\fR [\fB-fp\fR] \fIfilesystem\fR|\fIvolume\fR \fIfilesystem\fR|\fIvolume\fR
.fi

.LP
.nf
\fBzfs\fR \fBrename\fR \fB-r\fR \fIsnapshot\fR \fIsnapshot\fR
.fi

.LP
.nf
\fBzfs\fR \fBlist\fR [\fB-r\fR|\fB-d\fR \fIdepth\fR][\fB-Hp\fR][\fB-o\fR \fIproperty\fR[,\fIproperty\fR]...] [\fB-t\fR \fItype\fR[,\fItype\fR]..]
     [\fB-s\fR \fIproperty\fR] ... [\fB-S\fR \fIproperty\fR] ... [\fIfilesystem\fR|\fIvolume\fR|\fIsnapshot\fR|\fImountpoint\fR] ...
.fi

.LP
.nf
\fBzfs\fR \fBset\fR \fIproperty\fR=\fIvalue\fR... \fIfilesystem\fR|\fIvolume\fR|\fIsnapshot\fR...
.fi

.LP
.nf
\fBzfs\fR \fBget\fR [\fB-r\fR|\fB-d\fR \fIdepth\fR][\fB-Hp\fR][\fB-o\fR \fIfield\fR[,...]] [\fB-t\fR \fItype\fR[,...]]
    [\fB-s\fR \fIsource\fR[,...]] "\fIall\fR" | \fIproperty\fR[,...] \fIfilesystem\fR|\fIvolume\fR|\fIsnapshot\fR|\fImountpoint\fR ...
.fi

.LP
.nf
\fBzfs\fR \fBinherit\fR [\fB-rS\fR] \fIproperty\fR \fIfilesystem\fR|\fIvolume\fR|\fIsnapshot\fR ...
.fi

.LP
.nf
\fBzfs\fR \fBupgrade\fR [\fB-v\fR]
.fi

.LP
.nf
\fBzfs\fR \fBupgrade\fR [\fB-r\fR] [\fB-V\fR \fIversion\fR] \fB-a\fR | \fIfilesystem\fR
.fi

.LP
.nf
\fBzfs\fR \fBuserspace\fR [\fB-Hinp\fR] [\fB-o\fR \fIfield\fR[,...]] [\fB-s\fR \fIfield\fR] ...
    [\fB-S\fR \fIfield\fR] ... [\fB-t\fR \fItype\fR[,...]] \fIfilesystem\fR|\fIsnapshot\fR
.fi

.LP
.nf
\fBzfs\fR \fBgroupspace\fR [\fB-Hinp\fR] [\fB-o\fR \fIfield\fR[,...]] [\fB-s\fR \fIfield\fR] ...
    [\fB-S\fR \fIfield\fR] ... [\fB-t\fR \fItype\fR[,...]] \fIfilesystem\fR|\fIsnapshot\fR
.fi

.LP
.nf
\fBzfs\fR \fBmount\fR
.fi

.LP
.nf
\fBzfs\fR \fBmount\fR [\fB-vO\fR] [\fB-o \fIoptions\fR\fR] \fB-a\fR | \fIfilesystem\fR
.fi

.LP
.nf
\fBzfs\fR \fBunmount | umount\fR [\fB-f\fR] \fB-a\fR | \fIfilesystem\fR|\fImountpoint\fR
.fi

.LP
.nf
\fBzfs\fR \fBshare\fR [\fBnfs\fR|\fBsmb\fR] \fB-a\fR | \fIfilesystem\fR
.fi

.LP
.nf
\fBzfs\fR \fBunshare\fR [\fBnfs\fR|\fBsmb\fR] \fB-a\fR | \fIfilesystem\fR|\fImountpoint\fR
.fi

.LP
.nf
\fBzfs\fR \fBbookmark\fR \fIsnapshot\fR \fIbookmark\fR
.fi

.LP
.nf
\fBzfs\fR \fBsend\fR [\fB-DnPpRveLc\fR] [\fB-\fR[\fBiI\fR] \fIsnapshot\fR] \fIsnapshot\fR
.fi

.LP
.nf
\fBzfs\fR \fBsend\fR [\fB-Le\fR] [\fB-i \fIsnapshot\fR|\fIbookmark\fR]\fR \fIfilesystem\fR|\fIvolume\fR|\fIsnapshot\fR
.fi

.LP
.nf
\fBzfs\fR \fBsend\fR [\fB-Penv\fR] \fB-t\fR \fIreceive_resume_token\fR
.fi

.LP
.nf
\fBzfs\fR \fBreceive\fR [\fB-Fnsuv\fR] [\fB-o origin\fR=\fIsnapshot\fR] \fIfilesystem\fR|\fIvolume\fR|\fIsnapshot\fR
.fi

.LP
.nf
\fBzfs\fR \fBreceive\fR [\fB-Fnsuv\fR] [\fB-d\fR|\fB-e\fR] [\fB-o origin\fR=\fIsnapshot\fR] \fIfilesystem\fR
.fi

.LP
.nf
\fBzfs\fR \fBreceive\fR \fB-A\fR \fIfilesystem\fR|\fIvolume\fR
.fi

.LP
.nf
\fBzfs\fR \fBallow\fR \fIfilesystem\fR|\fIvolume\fR
.fi

.LP
.nf
\fBzfs\fR \fBallow\fR [\fB-ldug\fR] "\fIeveryone\fR"|\fIuser\fR|\fIgroup\fR[,...] \fIperm\fR|\fI@setname\fR[,...]
     \fIfilesystem\fR|\fIvolume\fR
.fi

.LP
.nf
\fBzfs\fR \fBallow\fR [\fB-ld\fR] \fB-e\fR \fIperm\fR|@\fIsetname\fR[,...] \fIfilesystem\fR|\fIvolume\fR
.fi

.LP
.nf
\fBzfs\fR \fBallow\fR \fB-c\fR \fIperm\fR|@\fIsetname\fR[,...] \fIfilesystem\fR|\fIvolume\fR
.fi

.LP
.nf
\fBzfs\fR \fBallow\fR \fB-s\fR @\fIsetname\fR \fIperm\fR|@\fIsetname\fR[,...] \fIfilesystem\fR|\fIvolume\fR
.fi

.LP
.nf
\fBzfs\fR \fBunallow\fR [\fB-rldug\fR] "\fIeveryone\fR"|\fIuser\fR|\fIgroup\fR[,...] [\fIperm\fR|@\fIsetname\fR[,... ]]
     \fIfilesystem\fR|\fIvolume\fR
.fi

.LP
.nf
\fBzfs\fR \fBunallow\fR [\fB-rld\fR] \fB-e\fR [\fIperm\fR|@\fIsetname\fR[,... ]] \fIfilesystem\fR|\fIvolume\fR
.fi

.LP
.nf
\fBzfs\fR \fBunallow\fR [\fB-r\fR] \fB-c\fR [\fIperm\fR|@\fIsetname\fR[ ... ]] \fIfilesystem\fR|\fIvolume\fR
.fi

.LP
.nf
\fBzfs\fR \fBunallow\fR [\fB-r\fR] \fB-s\fR @\fIsetname\fR [\fIperm\fR|@\fIsetname\fR[,... ]] \fIfilesystem\fR|\fIvolume\fR
.fi

.LP
.nf
\fBzfs\fR \fBhold\fR [\fB-r\fR] \fItag\fR \fIsnapshot\fR...
.fi

.LP
.nf
\fBzfs\fR \fBholds\fR [\fB-r\fR] \fIsnapshot\fR...
.fi

.LP
.nf
\fBzfs\fR \fBrelease\fR [\fB-r\fR] \fItag\fR \fIsnapshot\fR...
.fi

.LP
.nf
\fBzfs\fR \fBdiff\fR [\fB-FHt\fR] \fIsnapshot\fR \fIsnapshot\fR|\fIfilesystem\fR

.SH DESCRIPTION
.LP
The \fBzfs\fR command configures \fBZFS\fR datasets within a \fBZFS\fR storage pool, as described in \fBzpool\fR(8). A dataset is identified by a unique path within the \fBZFS\fR namespace. For example:
.sp
.in +2
.nf
pool/{filesystem,volume,snapshot}
.fi
.in -2
.sp

.sp
.LP
where the maximum length of a dataset name is \fBMAXNAMELEN\fR (256 bytes).
.sp
.LP
A dataset can be one of the following:
.sp
.ne 2
.na
\fB\fIfilesystem\fR\fR
.ad
.sp .6
.RS 4n
A \fBZFS\fR dataset of type \fBfilesystem\fR can be mounted within the standard system namespace and behaves like other file systems. While \fBZFS\fR file systems are designed to be \fBPOSIX\fR compliant, known issues exist that prevent compliance in some cases. Applications that depend on standards conformance might fail due to nonstandard behavior when checking file system free space.
.RE

.sp
.ne 2
.na
\fB\fIvolume\fR\fR
.ad
.sp .6
.RS 4n
A logical volume exported as a raw or block device. This type of dataset should only be used under special circumstances. File systems are typically used in most environments.
.RE

.sp
.ne 2
.na
\fB\fIsnapshot\fR\fR
.ad
.sp .6
.RS 4n
A read-only version of a file system or volume at a given point in time. It is specified as \fIfilesystem@name\fR or \fIvolume@name\fR.
.RE

.sp
.ne 2
.na
\fB\fIbookmark\fR\fR
.ad
.sp .6
.RS 4n
Much like a \fIsnapshot\fR, but without the hold on on-disk data. It can be used as the source of a send (but not for a receive).
It is specified as \fIfilesystem#name\fR or \fIvolume#name\fR.
.RE

.SS "ZFS File System Hierarchy"
.LP
A \fBZFS\fR storage pool is a logical collection of devices that provide space for datasets. A storage pool is also the root of the \fBZFS\fR file system hierarchy.
.sp
.LP
The root of the pool can be accessed as a file system, such as mounting and unmounting, taking snapshots, and setting properties. The physical storage characteristics, however, are managed by the \fBzpool\fR(8) command.
.sp
.LP
See \fBzpool\fR(8) for more information on creating and administering pools.
.SS "Snapshots"
.LP
A snapshot is a read-only copy of a file system or volume. Snapshots can be created extremely quickly, and initially consume no additional space within the pool. As data within the active dataset changes, the snapshot consumes more data than would otherwise be shared with the active dataset.
.sp
.LP
Snapshots can have arbitrary names. Snapshots of volumes can be cloned or rolled back.  Visibility is determined by the \fBsnapdev\fR property of the parent volume.
.sp
.LP
File system snapshots can be accessed under the \fB\&.zfs/snapshot\fR directory in the root of the file system. Snapshots are automatically mounted on demand and may be unmounted at regular intervals. The visibility of the \fB\&.zfs\fR directory can be controlled by the \fBsnapdir\fR property.
.SS "Bookmarks"
.LP
A bookmark is like a snapshot, a read-only copy of a file system or volume. Bookmarks can be created extremely quickly, compared to snapshots, and they consume no additional space within the pool.  Bookmarks can also have arbitrary names, much like snapshots.
.sp
.LP
Unlike snapshots, bookmarks can not be accessed through the filesystem in any way. From a storage standpoint a bookmark just provides a way to reference when a snapshot was created as a distinct object.  Bookmarks are initially tied to a snapshot, not the filesystem/volume, and they will survive if the snapshot itself is destroyed.  Since they are very light weight there's little incentive to destroy them.
.SS "Clones"
.LP
A clone is a writable volume or file system whose initial contents are the same as another dataset. As with snapshots, creating a clone is nearly instantaneous, and initially consumes no additional space.
.sp
.LP
Clones can only be created from a snapshot. When a snapshot is cloned, it creates an implicit dependency between the parent and child. Even though the clone is created somewhere else in the dataset hierarchy, the original snapshot cannot be destroyed as long as a clone exists. The \fBorigin\fR property exposes this dependency, and the \fBdestroy\fR command lists any such dependencies, if they exist.
.sp
.LP
The clone parent-child dependency relationship can be reversed by using the \fBpromote\fR subcommand. This causes the "origin" file system to become a clone of the specified file system, which makes it possible to destroy the file system that the clone was created from.
.SS "Mount Points"
.LP
Creating a \fBZFS\fR file system is a simple operation, so the number of file systems per system is likely to be numerous. To cope with this, \fBZFS\fR automatically manages mounting and unmounting file systems without the need to edit the \fB/etc/fstab\fR file. All automatically managed file systems are mounted by \fBZFS\fR at boot time.
.sp
.LP
By default, file systems are mounted under \fB/\fIpath\fR\fR, where \fIpath\fR is the name of the file system in the \fBZFS\fR namespace. Directories are created and destroyed as needed.
.sp
.LP
A file system can also have a mount point set in the \fBmountpoint\fR property. This directory is created as needed, and \fBZFS\fR automatically mounts the file system when the \fBzfs mount -a\fR command is invoked (without editing \fB/etc/fstab\fR). The \fBmountpoint\fR property can be inherited, so if \fBpool/home\fR has a mount point of \fB/export/stuff\fR, then \fBpool/home/user\fR automatically inherits a mount point of \fB/export/stuff/user\fR.
.sp
.LP
A file system \fBmountpoint\fR property of \fBnone\fR prevents the file system from being mounted.
.sp
.LP
If needed, \fBZFS\fR file systems can also be managed with traditional tools (\fBmount\fR, \fBumount\fR, \fB/etc/fstab\fR). If a file system's mount point is set to \fBlegacy\fR, \fBZFS\fR makes no attempt to manage the file system, and the administrator is responsible for mounting and unmounting the file system.
.SS "Deduplication"
.LP
Deduplication is the process for removing redundant data at the block-level, reducing the total amount of data stored. If a file system has the \fBdedup\fR property enabled, duplicate data blocks are removed synchronously.  The result is that only unique data is stored and common components are shared among files.
.sp
\fBWARNING: DO NOT ENABLE DEDUPLICATION UNLESS YOU NEED IT AND KNOW EXACTLY WHAT YOU ARE DOING!\fR
.sp
Deduplicating data is a very resource-intensive operation. It is generally recommended that you have \fIat least\fR 1.25 GiB of RAM per 1 TiB of storage when you enable deduplication. But calculating the exact requirements is a somewhat complicated affair.
.sp
Enabling deduplication on an improperly-designed system will result in extreme performance issues (extremely slow filesystem and snapshot deletions etc.) and can potentially lead to data loss (i.e. unimportable pool due to memory exhaustion) if your system is not built for this purpose. Deduplication affects the processing power (CPU), disks (and the controller) as well as primary (real) memory.
.sp
Before creating a pool with deduplication enabled, ensure that you have planned your hardware requirements appropriately and implemented appropriate recovery practices, such as regular backups.
.sp
Unless necessary, deduplication should NOT be enabled on a system. Instead, consider using \fIcompression=lz4\fR, as a less resource-intensive alternative.
.SS "Properties"
.sp
.LP
Properties are divided into two types: native properties and user-defined (or "user") properties. Native properties either export internal statistics or control \fBZFS\fR behavior. User properties have no effect on \fBZFS\fR behavior, but you can use them to annotate datasets and snapshots in a way that is meaningful in your environment.
.sp
.LP
Properties are generally inherited from the parent unless overridden by the child. See the documentation below for exceptions.
.sp
.LP
.SS "Native Properties"
Native properties apply to all dataset types unless otherwise noted. However, native properties cannot be edited on snapshots.
.sp
.LP
The values of numeric native properties can be specified using human-readable abbreviations (\fBK\fR, \fBM\fR, \fBG\fR, \fBT\fR, \fBP\fR, \fBE\fR, and \fBZ\fR). These abbreviations can optionally use the IEC binary prefixes (e.g. GiB) or SI decimal prefixes (e.g. GB), though the SI prefixes are treated as binary prefixes. Abbreviations are case-insensitive. The following are all valid (and equal) specifications:
.sp
.in +2
.nf
1536M, 1.5g, 1.50GB, 1.5GiB
.fi
.in -2
.sp

.sp
.LP
The values of non-numeric native properties are case-sensitive and must be lowercase, except for \fBmountpoint\fR, \fBsharenfs\fR, and \fBsharesmb\fR.
.sp
.LP
The following native properties consist of read-only statistics about the dataset. These properties can be neither set, nor inherited.
.sp
.ne 2
.na
\fB\fBavailable\fR\fR
.ad
.sp .6
.RS 4n
The amount of space available to the dataset and all its children, assuming that there is no other activity in the pool. Because space is shared within a pool, availability can be limited by any number of factors, including physical pool size, quotas, reservations, or other datasets within the pool.
.sp
This property can also be referred to by its shortened column name, \fBavail\fR.
.RE

.sp
.ne 2
.na
\fB\fBcompressratio\fR\fR
.ad
.sp .6
.RS 4n
For non-snapshots, the compression ratio achieved for the \fBused\fR space of this dataset, expressed as a multiplier.  The \fBused\fR property includes descendant datasets, and, for clones, does not include the space shared with the origin snapshot.  For snapshots, the \fBcompressratio\fR is the same as the \fBrefcompressratio\fR property.  The \fBcompression\fR property controls whether compression is enabled on a dataset.
.RE

.sp
.ne 2
.na
\fB\fBcreation\fR\fR
.ad
.sp .6
.RS 4n
The time this dataset was created.
.RE

.sp
.ne 2
.na
\fB\fBclones\fR\fR
.ad
.sp .6
.RS 4n
For snapshots, this property is a comma-separated list of filesystems or
volumes which are clones of this snapshot.  The clones' \fBorigin\fR property
is this snapshot.  If the \fBclones\fR property is not empty, then this
snapshot can not be destroyed (even with the \fB-r\fR or \fB-f\fR options). The
roles of origin and clone can be swapped by promoting the clone with the
\fBzfs promote\fR command.
.RE

.sp
.ne 2
.na
\fB\fBdefer_destroy\fR\fR
.ad
.sp .6
.RS 4n
This property is \fBon\fR if the snapshot has been marked for deferred destruction by using the \fBzfs destroy\fR \fB-d\fR command. Otherwise, the property is \fBoff\fR.
.RE

.sp
.ne 2
.na
\fB\fBfilesystem_count\fR
.ad
.sp .6
.RS 4n
The total number of filesystems and volumes that exist under this location in the
dataset tree.  This value is only available when a \fBfilesystem_limit\fR has
been set somewhere in the tree under which the dataset resides.
.RE

.sp
.ne 2
.na
\fB\fBlogicalreferenced\fR\fR
.ad
.sp .6
.RS 4n
The amount of space that is "logically" accessible by this dataset.  See
the \fBreferenced\fR property.  The logical space ignores the effect of
the \fBcompression\fR and \fBcopies\fR properties, giving a quantity
closer to the amount of data that applications see.  However, it does
include space consumed by metadata.
.sp
This property can also be referred to by its shortened column name,
\fBlrefer\fR.
.RE

.sp
.ne 2
.na
\fB\fBlogicalused\fR\fR
.ad
.sp .6
.RS 4n
The amount of space that is "logically" consumed by this dataset and all
its descendents.  See the \fBused\fR property.  The logical space
ignores the effect of the \fBcompression\fR and \fBcopies\fR properties,
giving a quantity closer to the amount of data that applications see.
However, it does include space consumed by metadata.
.sp
This property can also be referred to by its shortened column name,
\fBlused\fR.
.RE

.sp
.ne 2
.na
\fB\fBmounted\fR\fR
.ad
.sp .6
.RS 4n
For file systems, indicates whether the file system is currently mounted. This property can be either \fByes\fR or \fBno\fR.
.RE

.sp
.ne 2
.na
\fB\fBorigin\fR\fR
.ad
.sp .6
.RS 4n
For cloned file systems or volumes, the snapshot from which the clone was created. The origin cannot be destroyed (even with the \fB-r\fR or \fB-f\fR options) so long as a clone exists. See also the \fBclones\fR property.
.RE

.sp
.ne 2
.na
\fB\fBreceive_resume_token\fR\fR
.ad
.sp .6
.RS 4n
For filesystems or volumes which have saved partially-completed state from \fBzfs receive -s\fR , this opaque token can be provided to \fBzfs send -t\fR to resume and complete the \fBzfs receive\fR.
.RE

.sp
.ne 2
.mk
.na
\fB\fBreferenced\fR\fR
.ad
.sp .6
.RS 4n
The amount of data that is accessible by this dataset, which may or may not be shared with other datasets in the pool. When a snapshot or clone is created, it initially references the same amount of space as the file system or snapshot it was created from, since its contents are identical.
.sp
This property can also be referred to by its shortened column name, \fBrefer\fR.
.RE

.sp
.ne 2
.na
\fB\fBrefcompressratio\fR\fR
.ad
.sp .6
.RS 4n
The compression ratio achieved for the \fBreferenced\fR space of this
dataset, expressed as a multiplier.  See also the \fBcompressratio\fR
property.
.RE

.sp
.ne 2
.na
\fB\fBsnapshot_count\fR
.ad
.sp .6
.RS 4n
The total number of snapshots that exist under this location in the dataset tree.
This value is only available when a \fBsnapshot_limit\fR has been set somewhere
in the tree under which the dataset resides.
.RE

.sp
.ne 2
.na
\fB\fBtype\fR\fR
.ad
.sp .6
.RS 4n
The type of dataset: \fBfilesystem\fR, \fBvolume\fR, or \fBsnapshot\fR.
.RE

.sp
.ne 2
.na
\fB\fBused\fR\fR
.ad
.sp .6
.RS 4n
The amount of space consumed by this dataset and all its descendents. This is the value that is checked against this dataset's quota and reservation. The space used does not include this dataset's reservation, but does take into account the reservations of any descendent datasets. The amount of space that a dataset consumes from its parent, as well as the amount of space that is freed if this dataset is recursively destroyed, is the greater of its space used and its reservation.
.sp
The used space of a snapshot (see the "Snapshots" section) is space that is referenced exclusively by this snapshot. If this snapshot is destroyed, the amount of \fBused\fR space will be freed. Space that is shared by multiple snapshots isn't accounted for in this metric. When a snapshot is destroyed, space that was previously shared with this snapshot can become unique to snapshots adjacent to it, thus changing the used space of those snapshots. The used space of the latest snapshot can also be affected by changes in the file system. Note that the \fBused\fR space of a snapshot is a subset of the \fBwritten\fR space of the snapshot.
.sp
The amount of space used, available, or referenced does not take into account pending changes. Pending changes are generally accounted for within a few seconds. Committing a change to a disk using \fBfsync\fR(2) or \fBO_SYNC\fR (see \fBopen\fR(2)) does not necessarily guarantee that the space usage information is updated immediately.
.RE

.sp
.ne 2
.na
\fB\fBusedby*\fR\fR
.ad
.sp .6
.RS 4n
The \fBusedby*\fR properties decompose the \fBused\fR properties into the various reasons that space is used. Specifically, \fBused\fR = \fBusedbychildren\fR + \fBusedbydataset\fR + \fBusedbyrefreservation\fR + \fBusedbysnapshots\fR. These properties are only available for datasets created on \fBzpool\fR version 13 or higher pools.
.RE

.sp
.ne 2
.na
\fB\fBusedbychildren\fR\fR
.ad
.sp .6
.RS 4n
The amount of space used by children of this dataset, which would be freed if all the dataset's children were destroyed.
.RE

.sp
.ne 2
.na
\fB\fBusedbydataset\fR\fR
.ad
.sp .6
.RS 4n
The amount of space used by this dataset itself, which would be freed if the dataset were destroyed (after first removing any \fBrefreservation\fR and destroying any necessary snapshots or descendents).
.RE

.sp
.ne 2
.na
\fB\fBusedbyrefreservation\fR\fR
.ad
.sp .6
.RS 4n
The amount of space used by a \fBrefreservation\fR set on this dataset, which would be freed if the \fBrefreservation\fR was removed.
.RE

.sp
.ne 2
.na
\fB\fBusedbysnapshots\fR\fR
.ad
.sp .6
.RS 4n
The amount of space consumed by snapshots of this dataset. In particular, it is the amount of space that would be freed if all of this dataset's snapshots were destroyed. Note that this is not simply the sum of the snapshots' \fBused\fR properties because space can be shared by multiple snapshots.
.RE

.sp
.ne 2
.na
\fB\fBuserobjused@\fR\fIuser\fR\fR
.br
\fB\fBuserused@\fR\fIuser\fR\fR
.ad
.sp .6
.RS 4n
The amount of space consumed by the specified user in this dataset. Space is charged to the owner of each file, as displayed by \fBls\fR \fB-l\fR. The amount of space charged is displayed by \fBdu\fR and \fBls\fR \fB-s\fR. See the \fBzfs userspace\fR subcommand for more information.
.sp
Unprivileged users can access only their own space usage. The root user, or a user who has been granted the \fBuserused\fR privilege with \fBzfs allow\fR, can access everyone's usage.
.sp
The \fBuserused@\fR... properties are not displayed by \fBzfs get all\fR. The user's name must be appended after the \fB@\fR symbol, using one of the following forms:
.RS +4
.TP
.ie t \(bu
.el o
\fIPOSIX name\fR (for example, \fBjoe\fR)
.RE
.RS +4
.TP
.ie t \(bu
.el o
\fIPOSIX numeric ID\fR (for example, \fB789\fR)
.RE
.RS +4
.TP
.ie t \(bu
.el o
\fISID name\fR (for example, \fBjoe.smith@mydomain\fR)
.RE
.RS +4
.TP
.ie t \(bu
.el o
\fISID numeric ID\fR (for example, \fBS-1-123-456-789\fR)
.RE
.RE
Files created on Linux always have POSIX owners.

.RS 4n
The \fBuserobjused\fR is similar to \fBuserused\fR but instead it counts the number of objects consumed by \fIuser\fR. This feature doesn't count the internal objects used by ZFS, therefore it may under count a few objects comparing with the results of third-party tool such as \fBdfs -i\fR.
When the property \fBxattr=on\fR is set on a fileset, ZFS will create additional objects per-file to store extended attributes. These additional objects are reflected in the \fBuserobjused\fR value and are counted against the user's \fBuserobjquota\fR. When a filesystem is configured to use \fBxattr=sa\fR no additional internal objects are required.
.RE

.sp
.ne 2
.na
\fB\fBuserrefs\fR\fR
.ad
.sp .6
.RS 4n
This property is set to the number of user holds on this snapshot. User holds are set by using the \fBzfs hold\fR command.
.RE

.sp
.ne 2
.na
\fB\fBgroupused@\fR\fIgroup\fR\fR
.br
\fB\fBgroupobjused@\fR\fIgroup\fR\fR
.ad
.sp .6
.RS 4n
The amount of space consumed by the specified group in this dataset. Space is charged to the group of each file, as displayed by \fBls\fR \fB-l\fR. See the \fBuserused@\fR\fIuser\fR property for more information.
.sp
Unprivileged users can only access their own groups' space usage. The root user, or a user who has been granted the \fBgroupused\fR privilege with \fBzfs allow\fR, can access all groups' usage.
.RE

.RS 4n
The \fBgroupobjused\fR is similar to \fBgroupused\fR but instead it counts the number of objects consumed by \fIgroup\fR.
When the property \fBxattr=on\fR is set on a fileset, ZFS will create additional objects per-file to store extended attributes. These additional objects are reflected in the \fBgroupobjused\fR value and are counted against the group's \fBgroupobjquota.\fR. When a filesystem is configured to use \fBxattr=sa\fR no additional internal objects are required.
.RE

.sp
.ne 2
.na
\fB\fBvolblocksize\fR=\fIblocksize\fR\fR
.ad
.sp .6
.RS 4n
This property, which is only valid on volumes, specifies the block size of the volume. Any power of two from 512B to 128KiB is valid. The default is 8KiB.
.sp
This property cannot be changed after the volume is created.
.sp
This property can also be referred to by its shortened column name, \fBvolblock\fR.
.RE

.sp
.ne 2
.na
\fB\fBwritten\fR\fR
.ad
.sp .6
.RS 4n
The amount of space \fBreferenced\fR by this dataset, that was written since the previous snapshot
(i.e. that is not referenced by the previous snapshot).
.RE

.sp
.ne 2
.na
\fB\fBwritten@\fR\fIsnapshot\fR\fR
.ad
.sp .6
.RS 4n
The amount of \fBreferenced\fR space written to this dataset since the
specified snapshot.  This is the space that is referenced by this dataset
but was not referenced by the specified snapshot.
.sp
The \fIsnapshot\fR may be specified as a short snapshot name (just the part
after the \fB@\fR), in which case it will be interpreted as a snapshot in
the same filesystem as this dataset.
The \fIsnapshot\fR be a full snapshot name (\fIfilesystem\fR@\fIsnapshot\fR),
which for clones may be a snapshot in the origin's filesystem (or the origin
of the origin's filesystem, etc).
.RE

.sp
.LP
The following native properties can be used to change the behavior of a \fBZFS\fR dataset.
.sp
.ne 2
.na
\fB\fBaclinherit\fR=\fBrestricted\fR | \fBdiscard\fR | \fBnoallow\fR | \fBpassthrough\fR | \fBpassthrough-x\fR\fR
.ad
.sp .6
.RS 4n
Controls how \fBACL\fR entries are inherited when files and directories are created. A file system with an \fBaclinherit\fR property of \fBdiscard\fR does not inherit any \fBACL\fR entries. A file system with an \fBaclinherit\fR property value of \fBnoallow\fR only inherits inheritable \fBACL\fR entries that specify "deny" permissions. The property value \fBrestricted\fR (the default) removes the \fBwrite_acl\fR and \fBwrite_owner\fR permissions when the \fBACL\fR entry is inherited. A file system with an \fBaclinherit\fR property value of \fBpassthrough\fR inherits all inheritable \fBACL\fR entries without any modifications made to the \fBACL\fR entries when they are inherited. A file system with an \fBaclinherit\fR property value of \fBpassthrough-x\fR has the same meaning as \fBpassthrough\fR, except that the \fBowner@\fR, \fBgroup@\fR, and \fBeveryone@\fR \fBACE\fRs inherit the execute permission only if the file creation mode also requests the execute bit.
.sp
When the property value is set to \fBpassthrough\fR, files are created with a mode determined by the inheritable \fBACE\fRs. If no inheritable \fBACE\fRs exist that affect the mode, then the mode is set in accordance to the requested mode from the application.
.sp
The \fBaclinherit\fR property does not apply to Posix ACLs.
.RE

.sp
.ne 2
.na
\fB\fBacltype\fR=\fBoff\fR | \fBnoacl\fR | \fBposixacl\fR \fR
.ad
.sp .6
.RS 4n
Controls whether ACLs are enabled and if so what type of ACL to use.  When
a file system has the \fBacltype\fR property set to \fBoff\fR (the default)
then ACLs are disabled.  Setting the \fBacltype\fR property to \fBposixacl\fR
indicates Posix ACLs should be used.  Posix ACLs are specific to Linux and
are not functional on other platforms.  Posix ACLs are stored as an xattr and
therefore will not overwrite any existing ZFS/NFSv4 ACLs which may be set.
Currently only \fBposixacls\fR are supported on Linux.
.sp
To obtain the best performance when setting \fBposixacl\fR users are strongly
encouraged to set the \fBxattr=sa\fR property.  This will result in the
Posix ACL being stored more efficiently on disk.  But as a consequence of this
all new xattrs will only be accessible from ZFS implementations which support
the \fBxattr=sa\fR property.  See the \fBxattr\fR property for more details.
.sp
The value \fBnoacl\fR is an alias for \fBoff\fR.
.RE

.sp
.ne 2
.na
\fB\fBatime\fR=\fBon\fR | \fBoff\fR\fR
.ad
.sp .6
.RS 4n
Controls whether the access time for files is updated when they are read. Setting this property to \fBoff\fR avoids producing write traffic when reading files and can result in significant performance gains, though it might confuse mailers and other similar utilities. The default value is \fBon\fR.  See also \fBrelatime\fR below.
.sp
The values \fBon\fR and \fBoff\fR are equivalent to the \fBatime\fR and \fBnoatime\fR mount options.
.RE

.sp
.ne 2
.na
\fB\fBcanmount\fR=\fBon\fR | \fBoff\fR | \fBnoauto\fR\fR
.ad
.sp .6
.RS 4n
If this property is set to \fBoff\fR, the file system cannot be mounted, and is ignored by \fBzfs mount -a\fR. Setting this property to \fBoff\fR is similar to setting the \fBmountpoint\fR property to \fBnone\fR, except that the dataset still has a normal \fBmountpoint\fR property, which can be inherited. Setting this property to \fBoff\fR allows datasets to be used solely as a mechanism to inherit properties. One example of setting \fBcanmount=\fR\fBoff\fR is to have two datasets with the same \fBmountpoint\fR, so that the children of both datasets appear in the same directory, but might have different inherited characteristics.
.sp
When the \fBnoauto\fR option is set, a dataset can only be mounted and unmounted explicitly. The dataset is not mounted automatically when the dataset is created or imported, nor is it mounted by the \fBzfs mount -a\fR command or unmounted by the \fBzfs unmount -a\fR command.
.sp
This property is not inherited. Every dataset defaults to \fBon\fR independently.
.sp
The values \fBon\fR and \fBnoauto\fR are equivalent to the \fBauto\fR and \fBnoauto\fR mount options.
.RE

.sp
.ne 2
.na
\fB\fBchecksum\fR=\fBon\fR | \fBoff\fR | \fBfletcher2\fR | \fBfletcher4\fR | \fBsha256\fR | \fBnoparity\fR | \fBsha512\fR | \fBskein\fR | \fBedonr\fR\fR
.ad
.sp .6
.RS 4n
Controls the checksum used to verify data integrity. The default value is
\fBon\fR, which automatically selects an appropriate algorithm (currently,
\fBfletcher4\fR, but this may change in future releases). The value \fBoff\fR
disables integrity checking on user data.  The value \fBnoparity\fR not only
disables integrity but also disables maintaining parity for user data.
This setting is used internally by a dump device residing on a RAID-Z pool and
should not be used by any other dataset.  Disabling checksums is \fBNOT\fR a
recommended practice.
.sp
The \fBsha512\fR, \fBskein\fR, and \fBedonr\fR checksum algorithms require
enabling the appropriate features on the pool. Please see zpool-features for
more information on these algorithms.

Changing this property affects only newly-written data.
.RE

.sp
.ne 2
.na
\fB\fBcompression\fR=\fBoff\fR | \fBon\fR | \fBlzjb\fR | \fBlz4\fR |
\fBgzip\fR | \fBgzip-\fR\fIN\fR | \fBzle\fR\fR
.ad
.sp .6
.RS 4n
Controls the compression algorithm used for this dataset.
.sp
Setting compression to \fBon\fR indicates that the current default
compression algorithm should be used.  The default balances compression
and decompression speed, with compression ratio and is expected to
work well on a wide variety of workloads.  Unlike all other settings for
this property, \fBon\fR does not select a fixed compression type.  As
new compression algorithms are added to ZFS and enabled on a pool, the
default compression algorithm may change.  The current default compression
algorithm is either \fBlzjb\fR or, if the \fBlz4_compress\fR feature is
enabled, \fBlz4\fR.
.sp
The \fBlzjb\fR compression algorithm is optimized for performance while
providing decent data compression.
.sp
The \fBlz4\fR compression algorithm is a high-performance replacement
for the \fBlzjb\fR algorithm. It features significantly faster
compression and decompression, as well as a moderately higher
compression ratio than \fBlzjb\fR, but can only be used on pools with
the \fBlz4_compress\fR feature set to \fIenabled\fR. See
\fBzpool-features\fR(5) for details on ZFS feature flags and the
\fBlz4_compress\fR feature.
.sp
The \fBgzip\fR compression algorithm uses the same compression as
the \fBgzip\fR(1) command. You can specify the \fBgzip\fR level by using the
value \fBgzip-\fR\fIN\fR where \fIN\fR is an integer from 1 (fastest) to 9
(best compression ratio). Currently, \fBgzip\fR is equivalent to \fBgzip-6\fR
(which is also the default for \fBgzip\fR(1)). The \fBzle\fR compression
algorithm compresses runs of zeros.
.sp
This property can also be referred to by its shortened column name
\fBcompress\fR. Changing this property affects only newly-written data.
.RE

.sp
.ne 2
.na
\fB\fBcopies\fR=\fB1\fR | \fB2\fR | \fB3\fR\fR
.ad
.sp .6
.RS 4n
Controls the number of copies of data stored for this dataset. These copies are in addition to any redundancy provided by the pool, for example, mirroring or RAID-Z. The copies are stored on different disks, if possible. The space used by multiple copies is charged to the associated file and dataset, changing the \fBused\fR property and counting against quotas and reservations.
.sp
Changing this property only affects newly-written data.
.sp
Remember that \fBZFS\fR will not import a pool with a missing top-level vdev. Do NOT create, for example, a two-disk, striped pool and set \fBcopies=\fR\fI2\fR on some datasets thinking you have setup redundancy for them. When one disk dies, you will not be able to import the pool and will have lost all of your data.
.RE

.sp
.ne 2
.na
\fB\fBdedup\fR=\fBoff\fR | \fBon\fR | \fBverify\fR | \fBsha256\fR[,\fBverify\fR]\fR
.ad
.sp .6
.RS 4n
Controls whether deduplication is in effect for a dataset. The default value is \fBoff\fR. The default checksum used for deduplication is \fBsha256\fR (subject to change). When \fBdedup\fR is enabled, the \fBdedup\fR checksum algorithm overrides the \fBchecksum\fR property. Setting the value to \fBverify\fR is equivalent to specifying \fBsha256,verify\fR.
.sp
If the property is set to \fBverify\fR, then, whenever two blocks have the same signature, ZFS will do a byte-for-byte comparison with the existing block to ensure that the contents are identical.
.sp
Unless necessary, deduplication should NOT be enabled on a system. See \fBDeduplication\fR above.
.RE

.sp
.ne 2
.na
\fB\fBdevices\fR=\fBon\fR | \fBoff\fR\fR
.ad
.sp .6
.RS 4n
Controls whether device nodes can be opened on this file system. The default value is \fBon\fR.
.sp
The values \fBon\fR and \fBoff\fR are equivalent to the \fBdev\fR and \fBnodev\fR mount options.
.RE

.sp
.ne 2
.na
\fB\fBdnodesize\fR=\fBlegacy\fR | \fBauto\fR | \fB1k\fR | \fB2k\fR | \fB4k\fR | \fB8k\fR | \fB16k\fR\fR
.ad
.sp .6
.RS 4n
Specifies a compatibility mode or literal value for the size of dnodes
in the file system. The default value is \fBlegacy\fR. Setting this
property to a value other than \fBlegacy\fR requires the
\fBlarge_dnode\fR pool feature to be enabled.
.sp
Consider setting \fBdnodesize\fR to \fBauto\fR if the dataset uses the
\fBxattr=sa\fR property setting and the workload makes heavy use of
extended attributes. This may be applicable to SELinux-enabled systems,
Lustre servers, and Samba servers, for example. Literal values are
supported for cases where the optimal size is known in advance and for
performance testing.
.sp
Leave \fBdnodesize\fR set to \fBlegacy\fR if you need to receive
a \fBzfs send\fR stream of this dataset on a pool that doesn't enable
the \fBlarge_dnode\fR feature, or if you need to import this pool on a
system that doesn't support the \fBlarge_dnode\fR feature.
.sp
This property can also be referred to by its shortened column name,
\fBdnsize\fR.
.RE

.sp
.ne 2
.mk
.na
\fB\fBexec\fR=\fBon\fR | \fBoff\fR\fR
.ad
.sp .6
.RS 4n
Controls whether processes can be executed from within this file system. The default value is \fBon\fR.
.sp
The values \fBon\fR and \fBoff\fR are equivalent to the \fBexec\fR and \fBnoexec\fR mount options.
.RE

.sp
.ne 2
.na
\fB\fBmlslabel\fR=\fBnone\fR\fR | \fIlabel\fR
.ad
.sp .6
.RS 4n
The \fBmlslabel\fR property is a sensitivity label that determines if a dataset  can be mounted in a zone on a system with Trusted Extensions enabled. If the labeled dataset matches the labeled zone, the dataset can be mounted  and accessed from the labeled zone.
.sp
When the \fBmlslabel\fR property is not set, the default value is \fBnone\fR. Setting the  \fBmlslabel\fR property to \fBnone\fR is equivalent to removing the property.
.sp
The \fBmlslabel\fR property can be modified only when Trusted Extensions is enabled and only with appropriate privilege. Rights to modify it cannot be delegated. When changing a label to a higher label or setting the initial dataset label, the \fB{PRIV_FILE_UPGRADE_SL}\fR privilege is required. When changing a label to a lower label or the default (\fBnone\fR), the \fB{PRIV_FILE_DOWNGRADE_SL}\fR privilege is required. Changing the dataset to labels other than the default can be done only when the dataset is not mounted. When a dataset with the default label is mounted into a labeled-zone, the mount operation automatically sets the \fBmlslabel\fR property to the label of that zone.
.sp
When Trusted Extensions is \fBnot\fR enabled, only datasets with the default label (\fBnone\fR) can be mounted.
.sp
Zones are a Solaris feature and are not relevant on Linux.
.RE

.sp
.ne 2
.na
\fB\fBfilesystem_limit\fR=\fBnone\fR\fR | \fIcount\fR
.ad
.sp .6
.RS 4n
Limits the number of filesystems and volumes that can exist under this point in
the dataset tree.  The limit is not enforced if the user is allowed to change
the limit. Setting a filesystem_limit on a descendent of a filesystem that
already has a filesystem_limit does not override the ancestor's filesystem_limit,
but rather imposes an additional limit. This feature must be enabled to be used
(see \fBzpool-features\fR(5)).
.RE

.sp
.ne 2
.na
\fB\fBmountpoint\fR=\fIpath\fR | \fBnone\fR | \fBlegacy\fR\fR
.ad
.sp .6
.RS 4n
Controls the mount point used for this file system. See the "Mount Points" section for more information on how this property is used.
.sp
When the \fBmountpoint\fR property is changed for a file system, the file system and any children that inherit the mount point are unmounted. If the new value is \fBlegacy\fR, then they remain unmounted. Otherwise, they are automatically remounted in the new location if the property was previously \fBlegacy\fR or \fBnone\fR, or if they were mounted before the property was changed. In addition, any shared file systems are unshared and shared in the new location.
.RE

.sp
.ne 2
.na
\fB\fBnbmand\fR=\fBoff\fR | \fBon\fR\fR
.ad
.sp .6
.RS 4n
Controls whether the file system should be mounted with \fBnbmand\fR (Non Blocking mandatory locks). This is used for \fBCIFS\fR clients. Changes to this property only take effect when the file system is umounted and remounted. See \fBmount\fR(1M) on a Solaris system for more information on \fBnbmand\fR mounts.
.sp
The values \fBon\fR and \fBoff\fR are equivalent to the \fBnbmand\fR and \fBnonbmand\fR mount options.
.sp
This property is not used on Linux.
.RE

.sp
.ne 2
.na
\fB\fBprimarycache\fR=\fBall\fR | \fBnone\fR | \fBmetadata\fR\fR
.ad
.sp .6
.RS 4n
Controls what is cached in the primary cache (ARC). If this property is set to \fBall\fR, then both user data and metadata is cached. If this property is set to \fBnone\fR, then neither user data nor metadata is cached. If this property is set to \fBmetadata\fR, then only metadata is cached. The default value is \fBall\fR.
.RE

.sp
.ne 2
.na
\fB\fBquota\fR=\fBnone\fR | \fIsize\fR\fR
.ad
.sp .6
.RS 4n
Limits the amount of space a dataset and its descendents can consume. This property enforces a hard limit on the amount of space used. This includes all space consumed by descendents, including file systems and snapshots. Setting a quota on a descendent of a dataset that already has a quota does not override the ancestor's quota, but rather imposes an additional limit.
.sp
Quotas cannot be set on volumes, as the \fBvolsize\fR property acts as an implicit quota.
.RE

.sp
.ne 2
.na
\fB\fBsnapshot_limit\fR=\fBnone\fR\fR | \fIcount\fR
.ad
.sp .6
.RS 4n
Limits the number of snapshots that can be created on a dataset and its
descendents. Setting a snapshot_limit on a descendent of a dataset that already
has a snapshot_limit does not override the ancestor's snapshot_limit, but
rather imposes an additional limit. The limit is not enforced if the user is
allowed to change the limit. For example, this means that recursive snapshots
taken from the global zone are counted against each delegated dataset within
a zone. This feature must be enabled to be used (see \fBzpool-features\fR(5)).
.RE

.sp
.ne 2
.na
\fB\fBuserquota@\fR\fIuser\fR=\fBnone\fR | \fIsize\fR\fR
.br
\fB\fBuserobjquota@\fR\fIuser\fR=\fBnone\fR | \fIcount\fR\fR
.ad
.sp .6
.RS 4n
Limits the amount of space consumed by the specified user. Similar to the \fBrefquota\fR property, the \fBuserquota\fR space calculation does not include space that is used by descendent datasets, such as snapshots and clones. User space consumption is identified by the \fBuserspace@\fR\fIuser\fR property. See the \fBzfs userspace\fR subcommand for more information.
.sp
Enforcement of user quotas may be delayed by several seconds. This delay means that a user might exceed their quota before the system notices that they are over quota and begins to refuse additional writes with the \fBEDQUOT\fR error message.
.sp
Unprivileged users can only access their own groups' space usage. The root user, or a user who has been granted the \fBuserquota\fR privilege with \fBzfs allow\fR, can get and set everyone's quota.
.sp
This property is not available on volumes, on file systems before version 4, or on pools before version 15. The \fBuserquota@\fR... properties are not displayed by \fBzfs get all\fR. The user's name must be appended after the \fB@\fR symbol, using one of the following forms:
.RS +4
.TP
.ie t \(bu
.el o
\fIPOSIX name\fR (for example, \fBjoe\fR)
.RE
.RS +4
.TP
.ie t \(bu
.el o
\fIPOSIX numeric ID\fR (for example, \fB789\fR)
.RE
.RS +4
.TP
.ie t \(bu
.el o
\fISID name\fR (for example, \fBjoe.smith@mydomain\fR)
.RE
.RS +4
.TP
.ie t \(bu
.el o
\fISID numeric ID\fR (for example, \fBS-1-123-456-789\fR)
.RE
.RE
Files created on Linux always have POSIX owners.

.RS 4
The \fBuserobjquota\fR is similar to \fBuserquota\fR but it limits the number of objects a \fIuser\fR can create.
Please refer to \fBuserobjused\fR for more information about how ZFS counts object usage.
.RE

.sp
.ne 2
.na
\fB\fBgroupquota@\fR\fIgroup\fR=\fBnone\fR\fR | \fIsize\fR
.br
\fB\fBgroupobjquota@\fR\fIgroup\fR=\fBnone\fR\fR | \fIcount\fR
.ad
.sp .6
.RS 4n
Limits the amount of space consumed by the specified group. Group space consumption is identified by the \fBuserquota@\fR\fIuser\fR property.
.sp
Unprivileged users can access only their own groups' space usage. The root user, or a user who has been granted the \fBgroupquota\fR privilege with \fBzfs allow\fR, can get and set all groups' quotas.

The \fBgroupobjquota\fR is similar to \fBgroupquota\fR but it limits that the \fIgroup\fR can consume \fIcount\fR number of objects at most.
Please refer to \fBuserobjused\fR for more information about how zfs counts object usage.
.RE

.sp
.ne 2
.na
\fB\fBreadonly\fR=\fBoff\fR | \fBon\fR\fR
.ad
.sp .6
.RS 4n
Controls whether this dataset can be modified. The default value is \fBoff\fR.
.sp
This property can also be referred to by its shortened column name, \fBrdonly\fR.
.sp
The values \fBon\fR and \fBoff\fR are equivalent to the \fBro\fR and \fBrw\fR mount options.
.RE

.sp
.ne 2
.na
\fB\fBrecordsize\fR=\fIsize\fR\fR
.ad
.sp .6
.RS 4n
Specifies a suggested block size for files in the file system. This property is designed solely for use with database workloads that access files in fixed-size records. \fBZFS\fR automatically tunes block sizes according to internal algorithms optimized for typical access patterns.
.sp
For databases that create very large files but access them in small random chunks, these algorithms may be suboptimal. Specifying a \fBrecordsize\fR greater than or equal to the record size of the database can result in significant performance gains. Use of this property for general purpose file systems is strongly discouraged, and may adversely affect performance.
.sp
Any power of two from 512B to 1MiB is valid. The default is 128KiB. Values larger than 128KiB require the pool have the \fBlarge_blocks\fR feature enabled. See \fBzpool-features\fR(5) for details on ZFS feature flags and the \fBlarge_blocks\fR feature.
.sp
Changing the file system's \fBrecordsize\fR affects only files created afterward; existing files are unaffected.
.sp
This property can also be referred to by its shortened column name, \fBrecsize\fR.
.RE

.sp
.ne 2
.na
\fB\fBredundant_metadata\fR=\fBall\fR | \fBmost\fR\fR
.ad
.sp .6
.RS 4n
Controls what types of metadata are stored redundantly.  ZFS stores an
extra copy of metadata, so that if a single block is corrupted, the
amount of user data lost is limited.  This extra copy is in addition to
any redundancy provided at the pool level (e.g. by mirroring or RAID-Z),
and is in addition to an extra copy specified by the \fBcopies\fR
property (up to a total of 3 copies).  For example if the pool is
mirrored, \fBcopies\fR=2, and \fBredundant_metadata\fR=most, then ZFS
stores 6 copies of most metadata, and 4 copies of data and some
metadata.
.sp
When set to \fBall\fR, ZFS stores an extra copy of all metadata.  If a
single on-disk block is corrupt, at worst a single block of user data
(which is \fBrecordsize\fR bytes long) can be lost.
.sp
When set to \fBmost\fR, ZFS stores an extra copy of most types of
metadata.  This can improve performance of random writes, because less
metadata must be written.  In practice, at worst about 100 blocks (of
\fBrecordsize\fR bytes each) of user data can be lost if a single
on-disk block is corrupt.  The exact behavior of which metadata blocks
are stored redundantly may change in future releases.
.sp
The default value is \fBall\fR.
.RE

.sp
.ne 2
.na
\fB\fBrefquota\fR=\fBnone\fR | \fIsize\fR\fR
.ad
.sp .6
.RS 4n
Limits the amount of space a dataset can consume. This property enforces a hard limit on the amount of space used. This hard limit does not include space used by descendents, including file systems and snapshots.
.RE

.sp
.ne 2
.na
\fB\fBrefreservation\fR=\fBnone\fR | \fIsize\fR\fR
.ad
.sp .6
.RS 4n
The minimum amount of space guaranteed to a dataset, not including its descendents. When the amount of space used is below this value, the dataset is treated as if it were taking up the amount of space specified by \fBrefreservation\fR. The \fBrefreservation\fR reservation is accounted for in the parent datasets' space used, and counts against the parent datasets' quotas and reservations.
.sp
If \fBrefreservation\fR is set, a snapshot is only allowed if there is enough free pool space outside of this reservation to accommodate the current number of \fBreferenced\fR bytes in the dataset (which are the bytes to be referenced by the snapshot). This is necessary to continue to provide the \fBrefreservation\fRguarantee to the dataset.
.sp
For volumes, see also \fBvolsize\fR.
.sp
This property can also be referred to by its shortened column name, \fBrefreserv\fR.
.RE

.sp
.ne 2
.na
\fB\fBrelatime\fR=\fBoff\fR | \fBon\fR\fR
.ad
.sp .6
.RS 4n
Controls the manner in which the access time is updated when \fBatime=on\fR is set.  Turning this property \fBon\fR causes the access time to be updated relative to the modify or change time.  Access time is only updated if the previous access time was earlier than the current modify or change time or if the existing access time hasn't been updated within the past 24 hours.  The default value is \fBoff\fR.
.sp
The values \fBon\fR and \fBoff\fR are equivalent to the \fBrelatime\fR and \fBnorelatime\fR mount options.
.RE

.sp
.ne 2
.na
\fB\fBreservation\fR=\fBnone\fR | \fIsize\fR\fR
.ad
.sp .6
.RS 4n
The minimum amount of space guaranteed to a dataset and its descendents. When the amount of space used is below this value, the dataset is treated as if it were taking up the amount of space specified by its reservation. Reservations are accounted for in the parent datasets' space used, and count against the parent datasets' quotas and reservations.
.sp
This property can also be referred to by its shortened column name, \fBreserv\fR.
.RE

.sp
.ne 2
.na
\fB\fBsecondarycache\fR=\fBall\fR | \fBnone\fR | \fBmetadata\fR\fR
.ad
.sp .6
.RS 4n
Controls what is cached in the secondary cache (L2ARC). If this property is set to \fBall\fR, then both user data and metadata is cached. If this property is set to \fBnone\fR, then neither user data nor metadata is cached. If this property is set to \fBmetadata\fR, then only metadata is cached. The default value is \fBall\fR.
.RE

.sp
.ne 2
.na
\fB\fBsetuid\fR=\fBon\fR | \fBoff\fR\fR
.ad
.sp .6
.RS 4n
Controls whether the setuid bit is respected for the file system. The default value is \fBon\fR.
.sp
The values \fBon\fR and \fBoff\fR are equivalent to the \fBsuid\fR and \fBnosuid\fR mount options.
.RE

.sp
.ne 2
.na
\fB\fBsharesmb\fR=\fBoff\fR | \fBon\fR
.ad
.sp .6
.RS 4n
Controls whether the file system is shared by using \fBSamba USERSHARES\fR, and what options are to be used. Otherwise, the file system is automatically shared and unshared with the \fBzfs share\fR and \fBzfs unshare\fR commands. If the property is set to \fBon\fR, the \fBnet\fR(8) command is invoked to create a \fBUSERSHARE\fR.
.sp
Because \fBSMB\fR shares requires a resource name, a unique resource name is constructed from the dataset name. The constructed name is a copy of the dataset name except that the characters in the dataset name, which would be invalid in the resource name, are replaced with underscore (\fB_\fR) characters. Linux does not currently support additional options which might be available on Solaris.
.sp
If the \fBsharesmb\fR property is set to \fBoff\fR, the file systems are unshared.
.sp
In Linux, the share is created with the ACL (Access Control List) "Everyone:F" ("F" stands for "full permissions", ie. read and write permissions) and no guest access (which means Samba must be able to authenticate a real user, system passwd/shadow, LDAP or smbpasswd based) by default. This means that any additional access control (disallow specific user specific access etc) must be done on the underlaying filesystem.
.sp
.in +2
Example to mount a SMB filesystem shared through ZFS (share/tmp):
Note that a user and his/her password \fBmust\fR be given!
.sp
.in +2
smbmount //127.0.0.1/share_tmp /mnt/tmp -o user=workgroup/turbo,password=obrut,uid=1000
.in -2
.in -2
.sp
.ne 2
.na
\fBMinimal /etc/samba/smb.conf configuration\fR
.sp
.in +2
* Samba will need to listen to 'localhost' (127.0.0.1) for the zfs utilities to communicate with Samba.  This is the default behavior for most Linux distributions.
.sp
* Samba must be able to authenticate a user. This can be done in a number of ways, depending on if using the system password file, LDAP or the Samba specific smbpasswd file. How to do this is outside the scope of this manual. Please refer to the smb.conf(5) manpage for more information.
.sp
* See the \fBUSERSHARE\fR section of the \fBsmb.conf\fR(5) man page for all configuration options in case you need to modify any options to the share afterwards. Do note that any changes done with the 'net' command will be undone if the share is every unshared (such as at a reboot etc). In the future, ZoL will be able to set specific options directly using sharesmb=<option>.
.sp
.in -2
.RE

.sp
.ne 2
.na
\fB\fBsharenfs\fR=\fBoff\fR | \fBon\fR | \fIopts\fR\fR
.ad
.sp .6
.RS 4n
Controls whether the file system is shared via \fBNFS\fR, and what options are used. A file system with a \fBsharenfs\fR property of \fBoff\fR is managed with the \fBexportfs\fR(8) command and entries in \fB/etc/exports\fR file. Otherwise, the file system is automatically shared and unshared with the \fBzfs share\fR and \fBzfs unshare\fR commands. If the property is set to \fBon\fR, the dataset is shared using the \fBexportfs\fR(8) command in the following manner (see \fBexportfs\fR(8) for the meaning of the different options):
.sp
.in +4
.nf
/usr/sbin/exportfs -i -o sec=sys,rw,no_subtree_check,no_root_squash,mountpoint *:<mountpoint of dataset>
.fi
.in -4
.sp
Otherwise, the \fBexportfs\fR(8) command is invoked with options equivalent to the contents of this property.
.sp
When the \fBsharenfs\fR property is changed for a dataset, the dataset and any children inheriting the property are re-shared with the new options, only if the property was previously \fBoff\fR, or if they were shared before the property was changed. If the new property is \fBoff\fR, the file systems are unshared.
.RE

.sp
.ne 2
.na
\fB\fBlogbias\fR=\fBlatency\fR | \fBthroughput\fR\fR
.ad
.sp .6
.RS 4n
Provide a hint to ZFS about handling of synchronous requests in this dataset. If \fBlogbias\fR is set to \fBlatency\fR (the default), ZFS will use pool log devices (if configured) to handle the requests at low latency. If \fBlogbias\fR is set to \fBthroughput\fR, ZFS will not use configured pool log devices. ZFS will instead optimize synchronous operations for global pool throughput and efficient use of resources.
.RE

.sp
.ne 2
.na
\fB\fBsnapdev\fR=\fBhidden\fR | \fBvisible\fR\fR
.ad
.sp .6
.RS 4n
Controls whether the snapshots devices of zvol's are hidden or visible. The default value is \fBhidden\fR.
.sp
In this context, hidden does not refer to the concept of hiding files or directories by starting their name with a "." character. Even with \fBvisible\fR, the directory is still named \fB\&.zfs\fR. Instead, \fBhidden\fR means that the directory is not returned by \fBreaddir\fR(3), so it doesn't show up in directory listings done by any program, including \fBls\fR \fB-a\fR. It is still possible to chdir(2) into the directory, so \fBcd\fR \fB\&.zfs\fR works even with \fBhidden\fR. This unusual behavior is to protect against unwanted effects from applications recursing into the special \fB\&.zfs\fR directory.
.RE

.sp
.ne 2
.na
\fB\fBsnapdir\fR=\fBhidden\fR | \fBvisible\fR\fR
.ad
.sp .6
.RS 4n
Controls whether the \fB\&.zfs\fR directory is hidden or visible in the root of the file system as discussed in the "Snapshots" section. The default value is \fBhidden\fR.
.RE

.sp
.ne 2
.na
\fB\fBsync\fR=\fBstandard\fR | \fBalways\fR | \fBdisabled\fR\fR
.ad
.sp .6
.RS 4n
Controls the behavior of synchronous requests (e.g. fsync, O_DSYNC).
\fBstandard\fR is the POSIX specified behavior of ensuring all synchronous
requests are written to stable storage and all devices are flushed to ensure
data is not cached by device controllers (this is the default). \fBalways\fR
causes every file system transaction to be written and flushed before its
system call returns. This has a large performance penalty. \fBdisabled\fR
disables synchronous requests. File system transactions are only committed to
stable storage periodically. This option will give the highest performance.
However, it is very dangerous as ZFS would be ignoring the synchronous
transaction demands of applications such as databases or NFS.  Administrators
should only use this option when the risks are understood.
.RE

.sp
.ne 2
.na
\fB\fBversion\fR=\fB5\fR | \fB4\fR | \fB3\fR | \fB2\fR | \fB1\fR | \fBcurrent\fR\fR
.ad
.sp .6
.RS 4n
The on-disk version of this file system, which is independent of the pool version. This property can only be set to later supported versions. The value \fBcurrent\fR automatically selects the latest supported version. See the \fBzfs upgrade\fR command.
.RE

.sp
.ne 2
.na
\fB\fBvolsize\fR=\fIsize\fR\fR
.ad
.sp .6
.RS 4n
For volumes, specifies the logical size of the volume. By default, creating a volume establishes a \fBrefreservation\fR equal to the volume size plus the metadata required for a fully-written volume. (For pool version 8 or lower, a \fBreservation\fR is set instead.) Any changes to \fBvolsize\fR are reflected in an equivalent change to the \fBrefreservation\fR. The \fBvolsize\fR can only be set to a multiple of \fBvolblocksize\fR, and cannot be zero.
.sp
Without the reservation, the volume could run out of space, resulting in undefined behavior or data corruption, depending on how the volume is used. These effects can also occur when the volume size is changed while it is in use (particularly when shrinking the size). Extreme care should be used when adjusting the volume size.
.sp
A "sparse volume" (also known as "thin provisioning") can be created by specifying the \fB-s\fR option to the \fBzfs create -V\fR command, or by removing (or changing) the \fBrefreservation\fR after the volume has been created. A "sparse volume" is a volume where the \fBrefreservation\fR is unset or less then the volume size. Consequently, writes to a sparse volume can fail with \fBENOSPC\fR when the pool is low on space. For a sparse volume, changes to \fBvolsize\fR are not reflected in the reservation.
.RE

.sp
.ne 2
.na
\fB\fBvscan\fR=\fBoff\fR | \fBon\fR\fR
.ad
.sp .6
.RS 4n
Controls whether regular files should be scanned for viruses when a file is opened and closed. In addition to enabling this property, the virus scan service must also be enabled for virus scanning to occur. The default value is \fBoff\fR.
.sp
This property is not used on Linux.
.RE

.sp
.ne 2
.na
\fB\fBxattr\fR=\fBon\fR | \fBoff\fR | \fBsa\fR\fR
.ad
.sp .6
.RS 4n
Controls whether extended attributes are enabled for this file system.  Two
styles of extended attributes are supported either directory based or system
attribute based.
.sp
The default value of \fBon\fR enables directory based extended attributes.
This style of xattr imposes no practical limit on either the size or number of
xattrs which may be set on a file.  Although under Linux the \fBgetxattr\fR(2)
and \fBsetxattr\fR(2) system calls limit the maximum xattr size to 64K.  This
is the most compatible style of xattr and it is supported by the majority of
ZFS implementations.
.sp
System attribute based xattrs may be enabled by setting the value to \fBsa\fR.
The key advantage of this type of xattr is improved performance.  Storing
xattrs as system attributes significantly decreases the amount of disk IO
required.  Up to 64K of xattr data may be stored per file in the space reserved
for system attributes.  If there is not enough space available for an xattr then
it will be automatically written as a directory based xattr.  System attribute
based xattrs are not accessible on platforms which do not support the
\fBxattr=sa\fR feature.
.sp
The use of system attribute based xattrs is strongly encouraged for users of
SELinux or Posix ACLs.  Both of these features heavily rely of xattrs and
benefit significantly from the reduced xattr access time.
.sp
The values \fBon\fR and \fBoff\fR are equivalent to the \fBxattr\fR and \fBnoxattr\fR mount options.
.RE

.sp
.ne 2
.na
\fB\fBzoned\fR=\fBoff\fR | \fBon\fR\fR
.ad
.sp .6
.RS 4n
Controls whether the dataset is managed from a non-global zone. Zones are a Solaris feature and are not relevant on Linux. The default value is \fBoff\fR.
.RE

.sp
.LP
The following three properties cannot be changed after the file system is created, and therefore, should be set when the file system is created. If the properties are not set with the \fBzfs create\fR or \fBzpool create\fR commands, these properties are inherited from the parent dataset. If the parent dataset lacks these properties due to having been created prior to these features being supported, the new file system will have the default values for these properties.
.sp
.ne 2
.na
\fB\fBcasesensitivity\fR=\fBsensitive\fR | \fBinsensitive\fR | \fBmixed\fR\fR
.ad
.sp .6
.RS 4n
Indicates whether the file name matching algorithm used by the file system should be case-sensitive, case-insensitive, or allow a combination of both styles of matching. The default value for the \fBcasesensitivity\fR property is \fBsensitive\fR. Traditionally, UNIX and POSIX file systems have case-sensitive file names.
.sp
The \fBmixed\fR value for the \fBcasesensitivity\fR property indicates that the file system can support requests for both case-sensitive and case-insensitive matching behavior. Currently, case-insensitive matching behavior on a file system that supports mixed behavior is limited to the Solaris CIFS server product.
.RE

.sp
.ne 2
.na
\fB\fBnormalization\fR = \fBnone\fR | \fBformC\fR | \fBformD\fR | \fBformKC\fR | \fBformKD\fR\fR
.ad
.sp .6
.RS 4n
Indicates whether the file system should perform a Unicode normalization of file names whenever two file names are compared, and which normalization algorithm should be used.
.sp
If this property is set to a value other than \fBnone\fR (the default), and the \fButf8only\fR property was left unspecified, the \fButf8only\fR property is automatically set to \fBon\fR. See the cautionary note in the \fButf8only\fR section before modifying \fBnormalization\fR.
.sp
File names are always stored unmodified; names are normalized as part of any comparison process. Thus, \fBformC\fR and \fBformD\fR are equivalent, as are \fBformKC\fR and \fBformKD\fR. Given that, only \fBformD\fR and \fBformKD\fR make sense, as they are slightly faster because they avoid the additional canonical composition step.
.\" unicode.org says it's possible to quickly detect if a string is already in a given form. Since most text (basically everything but OS X) is already in NFC, this means formC could potentially be made faster. But the additional complexity probably isn't worth the likely undetectable in practice speed improvement.
.sp
The practical impact of this property is: \fBnone\fR (like traditional filesystems) allows a directory to contain two files that appear (to humans) to have the same name. The other options solve this problem, for different definitions of "the same". If you need to solve this problem and are not sure what to choose,\fBformD\fR.
.sp
This property cannot be changed after the file system is created.
.RE

.sp
.ne 2
.na
\fB\fButf8only\fR=\fBoff\fR | \fBon\fR\fR
.ad
.sp .6
.RS 4n
Indicates whether the file system should reject file names that include characters that are not present in the \fBUTF-8\fR character set. If this property is explicitly set to \fBoff\fR, the \fBnormalization\fR property must either not be explicitly set or be set to \fBnone\fR. The default value for the \fButf8only\fR property is \fBoff\fR.
.sp
Note that forcing the use of \fBUTF-8\fR filenames may cause pain for users. For example, extracting files from an archive will fail if the filenames within the archive are encoded in another character set.
.sp
If you are thinking of setting this (to \fBon\fR), you probably want to set \fBnormalization\fR=\fBformD\fR which will set this property to \fBon\fR implicitly.
.sp
This property cannot be changed after the file system is created.
.RE

.sp
.LP
The \fBcasesensitivity\fR, \fBnormalization\fR, and \fButf8only\fR properties are also permissions that can be assigned to non-privileged users by using the \fBZFS\fR delegated administration feature.
.RE

.sp
.ne 2
.na
\fB\fBcontext\fR=\fBnone\fR | \fISELinux_User:SElinux_Role:Selinux_Type:Sensitivity_Level\fR\fR
.ad
.sp .6
.RS 4n
This flag sets the SELinux context for all files in the filesystem under the mountpoint for that filesystem.  See \fBselinux\fR(8) for more information.
.RE

.sp
.ne 2
.na
\fB\fBfscontext\fR=\fBnone\fR | \fISELinux_User:SElinux_Role:Selinux_Type:Sensitivity_Level\fR\fR
.ad
.sp .6
.RS 4n
This flag sets the SELinux context for the filesystem being mounted.  See \fBselinux\fR(8) for more information.
.RE

.sp
.ne 2
.na
\fB\fBdefcontext\fR=\fBnone\fR | \fISELinux_User:SElinux_Role:Selinux_Type:Sensitivity_Level\fR\fR
.ad
.sp .6
.RS 4n
This flag sets the SELinux context for unlabeled files.  See \fBselinux\fR(8) for more information.
.RE

.sp
.ne 2
.na
\fB\fBrootcontext\fR=\fBnone\fR | \fISELinux_User:SElinux_Role:Selinux_Type:Sensitivity_Level\fR\fR
.ad
.sp .6
.RS 4n
This flag sets the SELinux context for the root inode of the filesystem.  See \fBselinux\fR(8) for more information.
.RE

.sp
.ne 2
.na
\fB\fBoverlay\fR=\fBoff\fR | \fBon\fR\fR
.ad
.sp .6
.RS 4n
Allow mounting on a busy directory or a directory which already contains files/directories. This is the default mount behavior for Linux filesystems.  However, for consistency with ZFS on other platforms overlay mounts are disabled by default.  Set \fBoverlay=on\fR to enable overlay mounts.
.RE

.SS "Temporary Mount Point Properties"
.LP
When a file system is mounted, either through \fBmount\fR(8) for legacy mounts or the \fBzfs mount\fR command for normal file systems, its mount options are set according to its properties. The correlation between properties and mount options is as follows:
.sp
.in +2
.nf
    PROPERTY                MOUNT OPTION
     atime                   atime/noatime
     canmount                auto/noauto
     devices                 devices/nodevices
     exec                    exec/noexec
     readonly                ro/rw
     relatime                relatime/norelatime
     setuid                  suid/nosuid
     xattr                   xattr/noxattr
     nbmand                  nbmand/nonbmand (Solaris)
.fi
.in -2
.sp

.sp
.LP
In addition, these options can be set on a per-mount basis using the \fB-o\fR option, without affecting the property that is stored on disk. The values specified on the command line override the values stored in the dataset. The \fB-nosuid\fR option is an alias for \fBnodevices,nosetuid\fR. These properties are reported as "temporary" by the \fBzfs get\fR command. If the properties are changed while the dataset is mounted, the new setting overrides any temporary settings.
.SS "User Properties"
.LP
In addition to the standard native properties, \fBZFS\fR supports arbitrary user properties. User properties have no effect on \fBZFS\fR behavior, but applications or administrators can use them to annotate datasets (file systems, volumes, and snapshots). Unlike native properties, user properties are editable on snapshots.
.sp
.LP
User property names must contain a colon (\fB:\fR) character to distinguish them from native properties. They may contain lowercase letters, numbers, and the following punctuation characters: colon (\fB:\fR), dash (\fB-\fR), period (\fB\&.\fR), and underscore (\fB_\fR). The expected convention is that the property name is divided into two portions such as \fImodule\fR\fB:\fR\fIproperty\fR, but this namespace is not enforced by \fBZFS\fR. User property names can be at most 256 characters, and cannot begin with a dash (\fB-\fR).
.sp
.LP
When making programmatic use of user properties, it is strongly suggested to use a reversed \fBDNS\fR domain name for the \fImodule\fR component of property names to reduce the chance that two independently-developed packages use the same property name for different purposes. For example, property names beginning with \fBcom.sun\fR. are reserved for definition by Oracle Corporation (which acquired Sun Microsystems).
.sp
.LP
The values of user properties are arbitrary strings, are always inherited, and are never validated. All of the commands that operate on properties (\fBzfs list\fR, \fBzfs get\fR, \fBzfs set\fR, and so forth) can be used to manipulate both native properties and user properties. Use the \fBzfs inherit\fR command to clear a user property. If the property is not defined in any parent dataset, it is removed entirely. Property values are limited to 8192 bytes.
.SS "ZFS Volumes as Swap"
.LP
\fBZFS\fR volumes may be used as Linux swap devices.  After creating the volume
with the \fBzfs create\fR command set up and enable the swap area using the
\fBmkswap\fR(8) and \fBswapon\fR(8) commands.  Do not swap to a file on a
\fBZFS\fR file system. A \fBZFS\fR swap file configuration is not supported.
.SH SUBCOMMANDS
.LP
All subcommands that modify state are logged persistently to the pool in their original form. The log can be viewed with \fBzpool history\fR.
.sp
.ne 2
.na
\fB\fBzfs ?\fR\fR
.ad
.sp .6
.RS 4n
Displays a help message.
.RE

.sp
.ne 2
.na
\fB\fBzfs create\fR [\fB-p\fR] [\fB-o\fR \fIproperty\fR=\fIvalue\fR] ... \fIfilesystem\fR\fR
.ad
.sp .6
.RS 4n
Creates a new \fBZFS\fR file system. The file system is automatically mounted according to the \fBmountpoint\fR and \fBcanmount\fR properties.
.sp
.ne 2
.na
\fB\fB-p\fR\fR
.ad
.sp .6
.RS 4n
Creates all the non-existing parent datasets. Datasets created in this manner inherit their properties; any property specified on the command line using the \fB-o\fR option applies only to the final child file system. If the target filesystem already exists, the operation completes successfully and no properties are changed.
.RE

.sp
.ne 2
.na
\fB\fB-o\fR \fIproperty\fR=\fIvalue\fR\fR
.ad
.sp .6
.RS 4n
Sets the specified property as if the command \fBzfs set\fR \fIproperty\fR=\fIvalue\fR was invoked at the same time the dataset was created. Any editable \fBZFS\fR property can also be set at creation time. Multiple \fB-o\fR options can be specified. An error results if the same property is specified in multiple \fB-o\fR options.
.RE

.RE

.sp
.ne 2
.na
\fB\fBzfs create\fR [\fB-ps\fR] [\fB-b\fR \fIblocksize\fR] [\fB-o\fR \fIproperty\fR=\fIvalue\fR] ... \fB-V\fR \fIsize\fR \fIvolume\fR\fR
.ad
.sp .6
.RS 4n
Creates a volume of the given size. The volume is exported as a block device in \fB/dev/zvol/\fR\fIpath\fR, where \fIpath\fR is the name of the volume in the \fBZFS\fR namespace. The size represents the logical size as exported by the device. By default, a \fBrefreservation\fR is created.
.sp
\fIsize\fR is automatically rounded up to the nearest 128KiB to ensure that the volume has an integral number of blocks regardless of \fIblocksize\fR.
.sp
.ne 2
.na
\fB\fB-p\fR\fR
.ad
.sp .6
.RS 4n
Creates all the non-existing parent datasets as file systems. Datasets created in this manner inherit their properties; any property specified on the command line using the \fB-o\fR option applies only to the final child volume. If the target volume already exists, the operation completes successfully and no properties are changed.
.RE

.sp
.ne 2
.na
\fB\fB-s\fR\fR
.ad
.sp .6
.RS 4n
Creates a sparse volume by omitting the automatic creation of a \fBrefreservation\fR. See \fBvolsize\fR in the Native Properties section for more information about sparse volumes. If this option is specified in conjunction with \fB-o\fR \fBrefreservation\fR, the \fBrefreservation\fR will be honored; this allows for a partial reservation on a sparse volume.
.RE

.sp
.ne 2
.na
\fB\fB-o\fR \fIproperty\fR=\fIvalue\fR\fR
.ad
.sp .6
.RS 4n
Sets the specified property as if the \fBzfs set\fR \fIproperty\fR=\fIvalue\fR command was invoked at the same time the dataset was created. Any editable \fBZFS\fR property can also be set at creation time. Multiple \fB-o\fR options can be specified. An error results if the same property is specified in multiple \fB-o\fR options.
.sp
If \fB-o\fR \fBvolsize\fR is provided, the resulting behavior is undefined; it conflicts with the -V option, which is required in this mode.
.RE

.sp
.ne 2
.na
\fB\fB-b\fR \fIblocksize\fR\fR
.ad
.sp .6
.RS 4n
Equivalent to \fB-o\fR \fBvolblocksize\fR=\fIblocksize\fR. If this option is specified in conjunction with \fB-o\fR \fBvolblocksize\fR, the resulting behavior is undefined.
.RE

.RE

.sp
.ne 2
.na
\fBzfs destroy\fR [\fB-fnpRrv\fR] \fIfilesystem\fR|\fIvolume\fR
.ad
.sp .6
.RS 4n
Destroys the given dataset. By default, the command unshares any file systems that are currently shared, unmounts any file systems that are currently mounted, and refuses to destroy a dataset that has active dependents (children or clones).
.sp
.ne 2
.na
\fB\fB-r\fR\fR
.ad
.sp .6
.RS 4n
Recursively destroy all children.
.RE

.sp
.ne 2
.na
\fB\fB-R\fR\fR
.ad
.sp .6
.RS 4n
Recursively destroy all dependents, including cloned file systems outside the target hierarchy.
.RE

.sp
.ne 2
.na
\fB\fB-f\fR\fR
.ad
.sp .6
.RS 4n
Force an unmount of any file systems using the \fBzfs unmount -f\fR command. This option has no effect on non-file systems or unmounted file systems.
.RE

.sp
.ne 2
.na
\fB\fB-n\fR\fR
.ad
.sp .6
.RS 4n
Do a dry-run ("No-op") deletion.  No data will be deleted.  This is
useful in conjunction with the \fB-v\fR or \fB-p\fR flags to determine what
data would be deleted.
.RE

.sp
.ne 2
.na
\fB\fB-p\fR\fR
.ad
.sp .6
.RS 4n
Print machine-parsable verbose information about the deleted data.
.RE

.sp
.ne 2
.na
\fB\fB-v\fR\fR
.ad
.sp .6
.RS 4n
Print verbose information about the deleted data.
.RE
.sp

Extreme care should be taken when applying either the \fB-r\fR or the \fB-R\fR options, as they can destroy large portions of a pool.
.RE

.sp
.ne 2
.na
\fBzfs destroy\fR [\fB-dnpRrv\fR] \fIfilesystem\fR|\fIvolume\fR@\fIsnap\fR[%\fIsnap\fR][,...]
.ad
.sp .6
.RS 4n
The specified snapshots are destroyed immediately if they have no clones and the user-initiated reference count is zero (i.e. there are no holds set with \fBzfs hold\fR). If these conditions are not met, this command returns an error, unless \fB-d\fR is supplied.
.sp
An inclusive range of snapshots may be specified by separating the
first and last snapshots with a percent sign.
The first and/or last snapshots may be left blank, in which case the
filesystem's oldest or newest snapshot will be implied.
.sp
Multiple snapshots
(or ranges of snapshots) of the same filesystem or volume may be specified
in a comma-separated list of snapshots.
Only the snapshot's short name (the
part after the \fB@\fR) should be specified when using a range or
comma-separated list to identify multiple snapshots.
.sp
.ne 2
.na
\fB\fB-d\fR\fR
.ad
.sp .6
.RS 4n
If a snapshot does not qualify for immediate destruction, rather than returning an error, it is marked for deferred destruction. In this state, it exists as a usable, visible snapshot until both of the preconditions listed above are met, at which point it is destroyed.
.RE

.sp
.ne 2
.na
\fB\fB-r\fR\fR
.ad
.sp .6
.RS 4n
Destroy (or mark for deferred destruction) all snapshots with this name in descendent file systems.
.RE

.sp
.ne 2
.na
\fB\fB-R\fR\fR
.ad
.sp .6
.RS 4n
Recursively destroy all clones of these snapshots, including the clones,
snapshots, and children.  If this flag is specified, the \fB-d\fR flag will
have no effect.
.RE

.sp
.ne 2
.na
\fB\fB-n\fR\fR
.ad
.sp .6
.RS 4n
Do a dry-run ("No-op") deletion.  No data will be deleted.  This is
useful in conjunction with the \fB-v\fR or \fB-p\fR flags to determine what
data would be deleted.
.RE

.sp
.ne 2
.na
\fB\fB-p\fR\fR
.ad
.sp .6
.RS 4n
Print machine-parsable verbose information about the deleted data.
.RE

.sp
.ne 2
.na
\fB\fB-v\fR\fR
.ad
.sp .6
.RS 4n
Print verbose information about the deleted data.
.RE

.sp
Extreme care should be taken when applying either the \fB-r\fR or the \fB-R\fR
options, as they can destroy large portions of a pool and cause unexpected
behavior for mounted file systems in use.
.RE

.RE

.sp
.ne 2
.na
\fBzfs destroy\fR \fIfilesystem\fR|\fIvolume\fR#\fIbookmark\fR
.ad
.sp .6
.RS 4n
The given bookmark is destroyed.

.RE

.sp
.ne 2
.na
\fB\fBzfs snapshot\fR [\fB-r\fR] [\fB-o\fR \fIproperty\fR=\fIvalue\fR] ... \fIfilesystem@snapname\fR|\fIvolume@snapname\fR\fR ...
.ad
.sp .6
.RS 4n
Creates snapshots with the given names. All previous modifications by successful system calls to the file system are part of the snapshots. Snapshots are taken atomically, so that all snapshots correspond to the same moment in time. See the "Snapshots" section for details.
.sp
.ne 2
.na
\fB\fB-r\fR\fR
.ad
.sp .6
.RS 4n
Recursively create snapshots of all descendent datasets.
.RE

.sp
.ne 2
.na
\fB\fB-o\fR \fIproperty\fR=\fIvalue\fR\fR
.ad
.sp .6
.RS 4n
Sets the specified property; see \fBzfs set\fR for details.
.RE

.RE

.sp
.ne 2
.na
\fB\fBzfs rollback\fR [\fB-rRf\fR] \fIsnapshot\fR\fR
.ad
.sp .6
.RS 4n
Roll back the given dataset to a previous snapshot. When a dataset is rolled back, all data that has changed since the snapshot is discarded, and the dataset reverts to the state at the time of the snapshot. By default, the command refuses to roll back to a snapshot other than the most recent one. In order to do so, all intermediate snapshots and bookmarks must be destroyed by specifying the \fB-r\fR option.
.sp
The \fB-rR\fR options do not recursively destroy the child snapshots of a recursive snapshot. Only direct snapshots of the specified filesystem are destroyed by either of these options. To completely roll back a recursive snapshot, you must rollback the individual child snapshots.
.sp
.ne 2
.na
\fB\fB-r\fR\fR
.ad
.sp .6
.RS 4n
Destroy any snapshots and bookmarks more recent than the one specified.
.RE

.sp