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Add description for GEOM RAID tunables/sysctls.

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MFC after:	1 week
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mav 2012-05-06 06:25:17 +00:00
parent 66bd98e788
commit 83acc7a4a7
1 changed files with 28 additions and 1 deletions
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sbin/geom/class/raid/graid.8
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@ -24,7 +24,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd May 3, 2012
.Dd May 6, 2012
.Dt GRAID 8
.Os
.Sh NAME
@ -276,6 +276,33 @@ corruption!
.Sh 2TiB BARRIERS
Promise metadata format does not support disks above 2TiB.
NVIDIA metadata format does not support volumes above 2TiB.
.Sh SYSCTL VARIABLES
The following
.Xr sysctl 8
variable can be used to control the behavior of the
.Nm RAID
GEOM class.
.Bl -tag -width indent
.It Va kern.geom.raid.aggressive_spare : No 0
Use any disks without metadata connected to controllers of the vendor
matching to volume metadata format as spare.
Use it with much care to not lose data if connecting unrelated disk!
.It Va kern.geom.raid.clean_time : No 5
Mark volume as clean when idle for the specified number of seconds.
.It Va kern.geom.raid.debug : No 0
Debug level of the
.Nm RAID
GEOM class.
.It Va kern.geom.raid.idle_threshold : No 1000000
Time in microseconds to consider a volume idle for rebuild puroses.
.It Va kern.geom.raid.name_format : No 0
Providers name format: 0 -- raid/r{num}, 1 -- raid/{label}.
.It Va kern.geom.raid.read_err_thresh : No 10
Number of read errors equated to disk failure.
Write errors are always considered as disk failures.
.It Va kern.geom.raid.start_timeout : No 30
Time to wait for missing array components on startup.
.El
.Sh EXIT STATUS
Exit status is 0 on success, and non-zero if the command fails.
.Sh SEE ALSO