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Expand the description of scan-related and other parameters.

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Document that the scan-related parameters are, in fact, applicable only
to scrub and/or resilver operations as appropriate.

Expand a few of the prefetch-related descriptions.

Add clarification to other module parameters.

Signed-off-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #2361
This commit is contained in:
Tim Chase 2014-06-04 07:23:31 -05:00 committed by Brian Behlendorf
parent beb4be77b7
commit 27b293be8a
1 changed files with 16 additions and 9 deletions
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25
man/man5/zfs-module-parameters.5
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@ -189,7 +189,7 @@ Default value: 24
\fBzfetch_array_rd_sz\fR (ulong)
.ad
.RS 12n
Number of bytes in a array_read
If prefetching is enabled, disable prefetching for reads larger than this size.
.sp
Default value: \fB1,048,576\fR.
.RE
@ -200,7 +200,7 @@ Default value: \fB1,048,576\fR.
\fBzfetch_block_cap\fR (uint)
.ad
.RS 12n
Max number of blocks to fetch at a time
Max number of blocks to prefetch at a time
.sp
Default value: \fB256\fR.
.RE
@ -211,7 +211,7 @@ Default value: \fB256\fR.
\fBzfetch_max_streams\fR (uint)
.ad
.RS 12n
Max number of streams per zfetch
Max number of streams per zfetch (prefetch streams per file).
.sp
Default value: \fB8\fR.
.RE
@ -222,7 +222,7 @@ Default value: \fB8\fR.
\fBzfetch_min_sec_reap\fR (uint)
.ad
.RS 12n
Min time before stream reclaim
Min time before an active prefetch stream can be reclaimed
.sp
Default value: \fB2\fR.
.RE
@ -343,7 +343,7 @@ Default value: \fB5\fR.
\fBzfs_autoimport_disable\fR (int)
.ad
.RS 12n
Disable pool import at module load
Disable pool import at module load by ignoring the cache file (typically \fB/etc/zfs/zpool.cache\fR).
.sp
Use \fB1\fR for yes and \fB0\fR for no (default).
.RE
@ -846,7 +846,9 @@ Use \fB1\fR for yes and \fB0\fR for no (default).
\fBzfs_resilver_delay\fR (int)
.ad
.RS 12n
Number of ticks to delay resilver
Number of ticks to delay prior to issuing a resilver I/O operation when
a non-resilver or non-scrub I/O operation has occurred within the past
\fBzfs_scan_idle\fR ticks.
.sp
Default value: \fB2\fR.
.RE
@ -868,7 +870,10 @@ Default value: \fB3,000\fR.
\fBzfs_scan_idle\fR (int)
.ad
.RS 12n
Idle window in clock ticks
Idle window in clock ticks. During a scrub or a resilver, if
a non-scrub or non-resilver I/O operation has occurred during this
window, the next scrub or resilver operation is delayed by, respectively
\fBzfs_scrub_delay\fR or \fBzfs_resilver_delay\fR ticks.
.sp
Default value: \fB50\fR.
.RE
@ -890,7 +895,9 @@ Default value: \fB1,000\fR.
\fBzfs_scrub_delay\fR (int)
.ad
.RS 12n
Number of ticks to delay scrub
Number of ticks to delay prior to issuing a scrub I/O operation when
a non-scrub or non-resilver I/O operation has occurred within the past
\fBzfs_scan_idle\fR ticks.
.sp
Default value: \fB4\fR.
.RE
@ -945,7 +952,7 @@ Default value: \fB2\fR.
\fBzfs_top_maxinflight\fR (int)
.ad
.RS 12n
Max I/Os per top-level
Max I/Os per top-level vdev during scrub or resilver operations.
.sp
Default value: \fB32\fR.
.RE