Document gmirror sysctls.
MFC after: 2 weeks
This commit is contained in:
parent
2ceafb776e
commit
3384cf0b45
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=326410
@ -24,7 +24,7 @@
|
|||||||
.\"
|
.\"
|
||||||
.\" $FreeBSD$
|
.\" $FreeBSD$
|
||||||
.\"
|
.\"
|
||||||
.Dd November 27, 2016
|
.Dd November 30, 2017
|
||||||
.Dt GMIRROR 8
|
.Dt GMIRROR 8
|
||||||
.Os
|
.Os
|
||||||
.Sh NAME
|
.Sh NAME
|
||||||
@ -337,6 +337,45 @@ gmirror deactivate data da1
|
|||||||
dd if=/dev/da1 of=/backup/data.img bs=1m
|
dd if=/dev/da1 of=/backup/data.img bs=1m
|
||||||
gmirror activate data da1
|
gmirror activate data da1
|
||||||
.Ed
|
.Ed
|
||||||
|
.Sh SYSCTL VARIABLES
|
||||||
|
The following
|
||||||
|
.Xr sysctl 8
|
||||||
|
variables can be used to configure behavior for all mirrors.
|
||||||
|
.Bl -tag -width indent
|
||||||
|
.It Va kern.geom.mirror.debug
|
||||||
|
Control the verbosity of kernel logging related to mirrors.
|
||||||
|
A value larger than 0 will enable debug logging.
|
||||||
|
.It Va kern.geom.mirror.timeout
|
||||||
|
The amount of time, in seconds, to wait for all copies of a mirror to
|
||||||
|
appear before starting the mirror.
|
||||||
|
Disks that appear after the mirror has been started are not automatically
|
||||||
|
added to the mirror.
|
||||||
|
.It Va kern.geom.mirror.idletime
|
||||||
|
The amount of time, in seconds, which must elapse after the last write to
|
||||||
|
a mirror before that mirror is marked clean.
|
||||||
|
Clean mirrors do not need to be synchronized after a power failure or
|
||||||
|
system crash.
|
||||||
|
A small value may result in frequent overwrites of the disks' metadata
|
||||||
|
sectors, and thus may reduce the longevity of the disks.
|
||||||
|
.It Va kern.geom.mirror.disconnect_on_failure
|
||||||
|
Determine whether a disk is automatically removed from its mirror when an
|
||||||
|
I/O request to that disk fails.
|
||||||
|
.It Va kern.geom.mirror.sync_requests
|
||||||
|
The number of parallel I/O requests used while synchronizing a mirror.
|
||||||
|
This parameter may only be configured as a
|
||||||
|
.Xr loader.conf 5
|
||||||
|
tunable.
|
||||||
|
.It Va kern.geom.mirror.sync_update_period
|
||||||
|
The period, in seconds, at which a synchronizing mirror's metadata is
|
||||||
|
updated.
|
||||||
|
Periodic updates are used to record a synchronization's progress so that
|
||||||
|
an interrupted synchronization may be resumed starting at the recorded
|
||||||
|
offset, rather than at the beginning.
|
||||||
|
A smaller value results in more accurate progress tracking, but also
|
||||||
|
increases the number of non-sequential writes to the disk being synchronized.
|
||||||
|
If the sysctl value is 0, no updates are performed until the synchronization
|
||||||
|
is complete.
|
||||||
|
.El
|
||||||
.Sh NOTES
|
.Sh NOTES
|
||||||
Doing kernel dumps to
|
Doing kernel dumps to
|
||||||
.Nm
|
.Nm
|
||||||
@ -382,6 +421,7 @@ there.
|
|||||||
.Xr mount 8 ,
|
.Xr mount 8 ,
|
||||||
.Xr newfs 8 ,
|
.Xr newfs 8 ,
|
||||||
.Xr savecore 8 ,
|
.Xr savecore 8 ,
|
||||||
|
.Xr sysctl 8 ,
|
||||||
.Xr umount 8
|
.Xr umount 8
|
||||||
.Sh HISTORY
|
.Sh HISTORY
|
||||||
The
|
The
|
||||||
@ -394,7 +434,3 @@ utility appeared in
|
|||||||
There should be a way to change a component's priority inside a running mirror.
|
There should be a way to change a component's priority inside a running mirror.
|
||||||
.Pp
|
.Pp
|
||||||
There should be a section with an implementation description.
|
There should be a section with an implementation description.
|
||||||
.Pp
|
|
||||||
Documentation for sysctls
|
|
||||||
.Va kern.geom.mirror.*
|
|
||||||
is missing.
|
|
||||||
|
Loading…
Reference in New Issue
Block a user