diff options
Diffstat (limited to 'man/man5/zfs-module-parameters.5')
| -rw-r--r-- | man/man5/zfs-module-parameters.5 | 121 |
1 files changed, 120 insertions, 1 deletions
diff --git a/man/man5/zfs-module-parameters.5 b/man/man5/zfs-module-parameters.5 index c1994f340..a1a586df1 100644 --- a/man/man5/zfs-module-parameters.5 +++ b/man/man5/zfs-module-parameters.5 @@ -14,7 +14,7 @@ .\" CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your .\" own identifying information: .\" Portions Copyright [yyyy] [name of copyright owner] -.TH ZFS-MODULE-PARAMETERS 5 "Feb 8, 2019" +.TH ZFS-MODULE-PARAMETERS 5 "Feb 15, 2019" .SH NAME zfs\-module\-parameters \- ZFS module parameters .SH DESCRIPTION @@ -1535,6 +1535,30 @@ Default value: \fB10\fR. .sp .ne 2 .na +\fBzfs_vdev_trim_max_active\fR (int) +.ad +.RS 12n +Maximum trim/discard I/Os active to each device. +See the section "ZFS I/O SCHEDULER". +.sp +Default value: \fB2\fR. +.RE + +.sp +.ne 2 +.na +\fBzfs_vdev_trim_min_active\fR (int) +.ad +.RS 12n +Minimum trim/discard I/Os active to each device. +See the section "ZFS I/O SCHEDULER". +.sp +Default value: \fB1\fR. +.RE + +.sp +.ne 2 +.na \fBzfs_vdev_queue_depth_pct\fR (int) .ad .RS 12n @@ -1619,6 +1643,12 @@ _ _ 512 ZFS_DEBUG_SET_ERROR Enable SET_ERROR and dprintf entries in the debug log. +_ +1024 ZFS_DEBUG_INDIRECT_REMAP + Verify split blocks created by device removal. +_ +2048 ZFS_DEBUG_TRIM + Verify TRIM ranges are always within the allocatable range tree. .TE .sp * Requires debug build. @@ -2344,6 +2374,82 @@ Default value: \fB75\fR%. .sp .ne 2 .na +\fBzfs_trim_extent_bytes_max\fR (unsigned int) +.ad +.RS 12n +Maximum size of TRIM command. Ranges larger than this will be split in to +chunks no larger than \fBzfs_trim_extent_bytes_max\fR bytes before being +issued to the device. +.sp +Default value: \fB134,217,728\fR. +.RE + +.sp +.ne 2 +.na +\fBzfs_trim_extent_bytes_min\fR (unsigned int) +.ad +.RS 12n +Minimum size of TRIM commands. TRIM ranges smaller than this will be skipped +unless they're part of a larger range which was broken in to chunks. This is +done because it's common for these small TRIMs to negatively impact overall +performance. This value can be set to 0 to TRIM all unallocated space. +.sp +Default value: \fB32,768\fR. +.RE + +.sp +.ne 2 +.na +\fBzfs_trim_metaslab_skip\fR (unsigned int) +.ad +.RS 12n +Skip uninitialized metaslabs during the TRIM process. This option is useful +for pools constructed from large thinly-provisioned devices where TRIM +operations are slow. As a pool ages an increasing fraction of the pools +metaslabs will be initialized progressively degrading the usefulness of +this option. This setting is stored when starting a manual TRIM and will +persist for the duration of the requested TRIM. +.sp +Default value: \fB0\fR. +.RE + +.sp +.ne 2 +.na +\fBzfs_trim_queue_limit\fR (unsigned int) +.ad +.RS 12n +Maximum number of queued TRIMs outstanding per leaf vdev. The number of +concurrent TRIM commands issued to the device is controlled by the +\fBzfs_vdev_trim_min_active\fR and \fBzfs_vdev_trim_max_active\fR module +options. +.sp +Default value: \fB10\fR. +.RE + +.sp +.ne 2 +.na +\fBzfs_trim_txg_batch\fR (unsigned int) +.ad +.RS 12n +The number of transaction groups worth of frees which should be aggregated +before TRIM operations are issued to the device. This setting represents a +trade-off between issuing larger, more efficient TRIM operations and the +delay before the recently trimmed space is available for use by the device. +.sp +Increasing this value will allow frees to be aggregated for a longer time. +This will result is larger TRIM operations and potentially increased memory +usage. Decreasing this value will have the opposite effect. The default +value of 32 was determined to be a reasonable compromise. +.sp +Default value: \fB32\fR. +.RE + +.sp +.ne 2 +.na \fBzfs_txg_history\fR (int) .ad .RS 12n @@ -2367,6 +2473,19 @@ Default value: \fB5\fR. .sp .ne 2 .na +\fBzfs_vdev_aggregate_trim\fR (int) +.ad +.RS 12n +Allow TRIM I/Os to be aggregated. This is normally not helpful because +the extents to be trimmed will have been already been aggregated by the +metaslab. This option is provided for debugging and performance analysis. +.sp +Default value: \fB0\fR. +.RE + +.sp +.ne 2 +.na \fBzfs_vdev_aggregation_limit\fR (int) .ad .RS 12n |