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+.\"
+.\" 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
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+.\" See the License for the specific language governing permissions
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+.\" If applicable, add the following below this CDDL HEADER, with the
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+.\" CDDL HEADER END
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+.\"
+.\" Copyright (c) 2009 Sun Microsystems, Inc. All Rights Reserved.
+.\" Copyright 2011 Joshua M. Clulow <[email protected]>
+.\" Copyright (c) 2011, 2019 by Delphix. All rights reserved.
+.\" Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
+.\" Copyright (c) 2014, Joyent, Inc. All rights reserved.
+.\" Copyright (c) 2014 by Adam Stevko. All rights reserved.
+.\" Copyright (c) 2014 Integros [integros.com]
+.\" Copyright 2019 Richard Laager. All rights reserved.
+.\" Copyright 2018 Nexenta Systems, Inc.
+.\" Copyright 2019 Joyent, Inc.
+.\"
+.Dd June 30, 2019
+.Dt ZFS-UPGRADE 8
+.Os Linux
+.Sh NAME
+.Nm zfs Ns Pf - Cm upgrade
+.Nd Manage upgrading the on-disk version of filesystems.
+.Sh SYNOPSIS
+.Nm
+.Cm upgrade
+.Nm
+.Cm upgrade
+.Fl v
+.Nm
+.Cm upgrade
+.Op Fl r
+.Op Fl V Ar version
+.Fl a | Ar filesystem
+.Sh DESCRIPTION
+.Bl -tag -width ""
+.It Xo
+.Nm
+.Cm upgrade
+.Xc
+Displays a list of file systems that are not the most recent version.
+.It Xo
+.Nm
+.Cm upgrade
+.Fl v
+.Xc
+Displays a list of currently supported file system versions.
+.It Xo
+.Nm
+.Cm upgrade
+.Op Fl r
+.Op Fl V Ar version
+.Fl a | Ar filesystem
+.Xc
+Upgrades file systems to a new on-disk version.
+Once this is done, the file systems will no longer be accessible on systems
+running older versions of the software.
+.Nm zfs Cm send
+streams generated from new snapshots of these file systems cannot be accessed on
+systems running older versions of the software.
+.Pp
+In general, the file system version is independent of the pool version.
+See
+.Xr zpool 8
+for information on the
+.Nm zpool Cm upgrade
+command.
+.Pp
+In some cases, the file system version and the pool version are interrelated and
+the pool version must be upgraded before the file system version can be
+upgraded.
+.Bl -tag -width "-V"
+.It Fl V Ar version
+Upgrade to the specified
+.Ar version .
+If the
+.Fl V
+flag is not specified, this command upgrades to the most recent version.
+This
+option can only be used to increase the version number, and only up to the most
+recent version supported by this software.
+.It Fl a
+Upgrade all file systems on all imported pools.
+.It Ar filesystem
+Upgrade the specified file system.
+.It Fl r
+Upgrade the specified file system and all descendent file systems.
+.El
+.El
+.Sh SEE ALSO
+.Xr zpool-upgrade 8