.\" 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 "Sept 28, 2017"
+.TH ZFS-MODULE-PARAMETERS 5 "Oct 28, 2017"
.SH NAME
zfs\-module\-parameters \- ZFS module parameters
.SH DESCRIPTION
\fBzfs_arc_grow_retry\fR (int)
.ad
.RS 12n
-After a memory pressure event the ARC will wait this many seconds before trying
-to resume growth
+If set to a non zero value, it will replace the arc_grow_retry value with this value.
+The arc_grow_retry value (default 5) is the number of seconds the ARC will wait before
+trying to resume growth after a memory pressure event.
.sp
-Default value: \fB5\fR.
+Default value: \fB0\fR.
.RE
.sp
Default value: \fB0\fR.
.RE
+.sp
+.ne 2
+.na
+\fBzfs_arc_meta_adjust_restarts\fR (ulong)
+.ad
+.RS 12n
+The number of restart passes to make while scanning the ARC attempting
+the free buffers in order to stay below the \fBzfs_arc_meta_limit\fR.
+This value should not need to be tuned but is available to facilitate
+performance analysis.
+.sp
+Default value: \fB4096\fR.
+.RE
+
.sp
.ne 2
.na
.sp
.ne 2
.na
-\fBzfs_arc_meta_adjust_restarts\fR (ulong)
+\fBzfs_arc_meta_strategy\fR (int)
.ad
.RS 12n
-The number of restart passes to make while scanning the ARC attempting
-the free buffers in order to stay below the \fBzfs_arc_meta_limit\fR.
-This value should not need to be tuned but is available to facilitate
-performance analysis.
+Define the strategy for ARC meta data buffer eviction (meta reclaim strategy).
+A value of 0 (META_ONLY) will evict only the ARC meta data buffers.
+A value of 1 (BALANCED) indicates that additional data buffers may be evicted if
+that is required to in order to evict the required number of meta data buffers.
.sp
-Default value: \fB4096\fR.
+Default value: \fB1\fR.
.RE
.sp
\fBzfs_arc_min\fR (ulong)
.ad
.RS 12n
-Min arc size
+Min arc size of ARC in bytes. If set to 0 then arc_c_min will default to
+consuming the larger of 32M or 1/32 of total system memory.
.sp
-Default value: \fB100\fR.
+Default value: \fB0\fR.
.RE
.sp
\fBzfs_arc_p_min_shift\fR (int)
.ad
.RS 12n
-arc_c shift to calc min/max arc_p
+If set to a non zero value, this will update arc_p_min_shift (default 4)
+with the new value.
+arc_p_min_shift is used to shift of arc_c for calculating both min and max
+max arc_p
.sp
-Default value: \fB4\fR.
+Default value: \fB0\fR.
.RE
.sp
\fBzfs_arc_shrink_shift\fR (int)
.ad
.RS 12n
-log2(fraction of arc to reclaim)
+If set to a non zero value, this will update arc_shrink_shift (default 7)
+with the new value.
.sp
-Default value: \fB5\fR.
+Default value: \fB0\fR.
.RE
.sp
Historical statistics for the last N txgs will be available in
\fB/proc/spl/kstat/zfs/<pool>/txgs\fR
.sp
-Default value: \fB100\fR.
+Default value: \fB0\fR.
.RE
.sp
\fBzfs_vdev_cache_max\fR (int)
.ad
.RS 12n
-Inflate reads small than this value to meet the \fBzfs_vdev_cache_bshift\fR
-size.
+Inflate reads smaller than this value to meet the \fBzfs_vdev_cache_bshift\fR
+size (default 64k).
.sp
Default value: \fB16384\fR.
.RE
\fBzfs_vdev_scheduler\fR (charp)
.ad
.RS 12n
-Set the Linux I/O scheduler on whole disk vdevs to this scheduler
+Set the Linux I/O scheduler on whole disk vdevs to this scheduler. Valid options
+are noop, cfq, bfq & deadline
.sp
Default value: \fBnoop\fR.
.RE