diff options
Diffstat (limited to 'man/man5/zfs-module-parameters.5')
| -rw-r--r-- | man/man5/zfs-module-parameters.5 | 51 |
1 files changed, 42 insertions, 9 deletions
diff --git a/man/man5/zfs-module-parameters.5 b/man/man5/zfs-module-parameters.5 index a7623ff27..40666c8f3 100644 --- a/man/man5/zfs-module-parameters.5 +++ b/man/man5/zfs-module-parameters.5 @@ -87,7 +87,7 @@ Default value: \fB10\fR%. .ad .RS 12n Set the size of the dbuf cache, \fBdbuf_cache_max_bytes\fR, to a log2 fraction -of the target arc size. +of the target ARC size. .sp Default value: \fB5\fR. .RE @@ -99,7 +99,7 @@ Default value: \fB5\fR. .ad .RS 12n Set the size of the dbuf metadata cache, \fBdbuf_metadata_cache_max_bytes\fR, -to a log2 fraction of the target arc size. +to a log2 fraction of the target ARC size. .sp Default value: \fB6\fR. .RE @@ -179,7 +179,10 @@ Default value: \fB1\fR. .ad .RS 12n How far through the ARC lists to search for L2ARC cacheable content, expressed -as a multiplier of \fBl2arc_write_max\fR +as a multiplier of \fBl2arc_write_max\fR. +ARC persistence across reboots can be achieved with persistent L2ARC by setting +this parameter to \fB0\fR allowing the full length of ARC lists to be searched +for cacheable content. .sp Default value: \fB2\fR. .RE @@ -203,7 +206,7 @@ Default value: \fB200\fR%. .ad .RS 12n Do not write buffers to L2ARC if they were prefetched but not used by -applications +applications. .sp Use \fB1\fR for yes (default) and \fB0\fR to disable. .RE @@ -214,7 +217,7 @@ Use \fB1\fR for yes (default) and \fB0\fR to disable. \fBl2arc_norw\fR (int) .ad .RS 12n -No reads during writes +No reads during writes. .sp Use \fB1\fR for yes and \fB0\fR for no (default). .RE @@ -237,7 +240,7 @@ Default value: \fB8,388,608\fR. \fBl2arc_write_max\fR (ulong) .ad .RS 12n -Max write bytes per interval +Max write bytes per interval. .sp Default value: \fB8,388,608\fR. .RE @@ -245,6 +248,36 @@ Default value: \fB8,388,608\fR. .sp .ne 2 .na +\fBl2arc_rebuild_enabled\fR (int) +.ad +.RS 12n +Rebuild the L2ARC when importing a pool (persistent L2ARC). This can be +disabled if there are problems importing a pool or attaching an L2ARC device +(e.g. the L2ARC device is slow in reading stored log metadata, or the metadata +has become somehow fragmented/unusable). +.sp +Use \fB1\fR for yes (default) and \fB0\fR for no. +.RE + +.sp +.ne 2 +.na +\fBl2arc_rebuild_blocks_min_l2size\fR (ulong) +.ad +.RS 12n +Min size (in bytes) of an L2ARC device required in order to write log blocks +in it. The log blocks are used upon importing the pool to rebuild +the L2ARC (persistent L2ARC). Rationale: for L2ARC devices less than 1GB, the +amount of data l2arc_evict() evicts is significant compared to the amount of +restored L2ARC data. In this case do not write log blocks in L2ARC in order not +to waste space. +.sp +Default value: \fB1,073,741,824\fR (1GB). +.RE + +.sp +.ne 2 +.na \fBmetaslab_aliquot\fR (ulong) .ad .RS 12n @@ -614,7 +647,7 @@ Default value: \fB1\fR. .ad .RS 12n Sets the maximum number of bytes to consume during pool import to the log2 -fraction of the target arc size. +fraction of the target ARC size. .sp Default value: \fB4\fR. .RE @@ -963,7 +996,7 @@ Default value: \fB1\fR. \fBzfs_arc_min\fR (ulong) .ad .RS 12n -Min arc size of ARC in bytes. If set to 0 then arc_c_min will default to +Min 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: \fB0\fR. @@ -1088,7 +1121,7 @@ Default value: \fB0\fR. Percent of pagecache to reclaim arc to This tunable allows ZFS arc to play more nicely with the kernel's LRU -pagecache. It can guarantee that the arc size won't collapse under scanning +pagecache. It can guarantee that the ARC size won't collapse under scanning pressure on the pagecache, yet still allows arc to be reclaimed down to zfs_arc_min if necessary. This value is specified as percent of pagecache size (as measured by NR_FILE_PAGES) where that percent may exceed 100. This |