diff options
author | Jason McIntyre <jmc@cvs.openbsd.org> | 2010-04-01 17:06:56 +0000 |
---|---|---|
committer | Jason McIntyre <jmc@cvs.openbsd.org> | 2010-04-01 17:06:56 +0000 |
commit | 9698d2b8e3176084d4d635d12f1e2fdd725ef5c1 (patch) | |
tree | f63ea23a1c5f801ecbb215234160ada4dc8bef52 /share/man/man4 | |
parent | 8af4a82e8387c83fb0949f0f1c8a9ab7ce9120e7 (diff) |
WARNINGS -> CAVEATS, and a little neccessary cleanup;
Diffstat (limited to 'share/man/man4')
-rw-r--r-- | share/man/man4/raid.4 | 46 |
1 files changed, 23 insertions, 23 deletions
diff --git a/share/man/man4/raid.4 b/share/man/man4/raid.4 index f338c9cf3c3..7445c6fb384 100644 --- a/share/man/man4/raid.4 +++ b/share/man/man4/raid.4 @@ -1,4 +1,4 @@ -.\" $OpenBSD: raid.4,v 1.30 2008/06/26 05:42:07 ray Exp $ +.\" $OpenBSD: raid.4,v 1.31 2010/04/01 17:06:55 jmc Exp $ .\" $NetBSD: raid.4,v 1.20 2001/09/22 16:03:58 wiz Exp $ .\" .\" Copyright (c) 1998 The NetBSD Foundation, Inc. @@ -54,7 +54,7 @@ .\" any improvements or extensions that they make and grant Carnegie the .\" rights to redistribute these changes. .\" -.Dd $Mdocdate: June 26 2008 $ +.Dd $Mdocdate: April 1 2010 $ .Dt RAID 4 .Os .Sh NAME @@ -289,26 +289,6 @@ Additional debug information can be sent to the console by specifying: .Bd -unfilled -offset indent option RAIDDEBUG .Ed -.Sh WARNINGS -Certain RAID levels (1, 4, 5, 6, and others) can protect against some -data loss due to component failure. -However the loss of two components of a RAID 4 or 5 system, or the loss -of a single component of a RAID 0 system, will result in the entire -filesystems on that RAID device being lost. -RAID is -.Ar NOT -a substitute for good backup practices. -.Pp -Recomputation of parity -.Ar MUST -be performed whenever there is a chance that it may have been -compromised. -This includes after system crashes, or before a RAID -device has been used for the first time. -Failure to keep parity correct will be catastrophic should a component -ever fail -- it is better to use RAID 0 and get the additional space and -speed, than it is to use parity, but not keep the parity correct. -At least with RAID 0 there is no perception of increased data security. .Sh FILES .Bl -tag -width /dev/XXrXraidX -compact .It Pa /dev/{,r}raid* @@ -319,9 +299,9 @@ device special files. .Xr ccd 4 , .Xr sd 4 , .Xr wd 4 , -.Xr MAKEDEV 8 , .Xr config 8 , .Xr fsck 8 , +.Xr MAKEDEV 8 , .Xr mount 8 , .Xr newfs 8 , .Xr raidctl 8 @@ -352,3 +332,23 @@ driver first appeared in .Nx 1.4 from where it was ported to .Ox 2.5 . +.Sh CAVEATS +Certain RAID levels (1, 4, 5, 6, and others) can protect against some +data loss due to component failure. +However the loss of two components of a RAID 4 or 5 system, or the loss +of a single component of a RAID 0 system, will result in the entire +filesystems on that RAID device being lost. +RAID is +.Ar NOT +a substitute for good backup practices. +.Pp +Recomputation of parity +.Ar MUST +be performed whenever there is a chance that it may have been +compromised. +This includes after system crashes, or before a RAID +device has been used for the first time. +Failure to keep parity correct will be catastrophic should a component +ever fail -- it is better to use RAID 0 and get the additional space and +speed, than it is to use parity, but not keep the parity correct. +At least with RAID 0 there is no perception of increased data security. |