diff options
author | Jason McIntyre <jmc@cvs.openbsd.org> | 2009-04-29 07:02:03 +0000 |
---|---|---|
committer | Jason McIntyre <jmc@cvs.openbsd.org> | 2009-04-29 07:02:03 +0000 |
commit | ab5a8cd69b2244b61e31a22a66a0d32f08c084b2 (patch) | |
tree | a7ba107919d19af33c338a286d785a5cd28dc7cb /share/man | |
parent | 28d9932de5b3b21cd2af2aa63dc273e53c09f55f (diff) |
clarify fstype `raid' and some other small bits whilst here;
prodded by a "conversation" on misc from Sebastian Rother
ok marco
Diffstat (limited to 'share/man')
-rw-r--r-- | share/man/man4/softraid.4 | 57 |
1 files changed, 26 insertions, 31 deletions
diff --git a/share/man/man4/softraid.4 b/share/man/man4/softraid.4 index 77440532ddc..743cb15a50d 100644 --- a/share/man/man4/softraid.4 +++ b/share/man/man4/softraid.4 @@ -1,4 +1,4 @@ -.\" $OpenBSD: softraid.4,v 1.19 2008/09/05 06:58:42 fkr Exp $ +.\" $OpenBSD: softraid.4,v 1.20 2009/04/29 07:02:02 jmc Exp $ .\" .\" Copyright (c) 2007 Todd T. Fries <todd@OpenBSD.org> .\" Copyright (c) 2007 Marco Peereboom <marco@OpenBSD.org> @@ -15,7 +15,7 @@ .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. .\" -.Dd $Mdocdate: September 5 2008 $ +.Dd $Mdocdate: April 29 2009 $ .Dt SOFTRAID 4 .Os .Sh NAME @@ -48,6 +48,23 @@ Essentially a discipline is a lower level driver that provides the I/O transformation for the softraid device. .Pp +A +.Em volume +is a virtual disk device that is made up of a collection of chunks. +.Pp +A +.Em chunk +is a partition or storage area of fstype +.Dq RAID . +.Xr disklabel 8 +can be used to alter the fstype, +though some platforms, +such as SUN, +are not capable of using this +and should use fstype +.Dq 4.2BSD +instead. +.Pp Currently .Nm supports the following disciplines: @@ -56,33 +73,25 @@ supports the following disciplines: A .Em striping discipline. -It segments data over a number of disks to increase performance. +It segments data over a number of chunks to increase performance. RAID 0 does not provide for data loss (redundancy). .It RAID 1 A .Em mirroring discipline. -It copies data across more than one disk to provide for data loss. +It copies data across more than one chunk to provide for data loss. Read performance is increased, though at the cost of write speed. Unlike traditional RAID 1, .Nm -supports the use of more than two disks in a RAID 1 setup. +supports the use of more than two chunks in a RAID 1 setup. .It CRYPTO An .Em encrypting discipline. -It encrypts data on a single disk to provide for data confidentiality. +It encrypts data on a single chunk to provide for data confidentiality. CRYPTO does not provide redundancy. .El -.Pp -A -.Em volume -is a virtual disk device that is made up of a collection of chunks. -.Pp -A -.Em chunk -is a partition or storage area of the type RAID. .Sh EXAMPLES An example to create a 3 chunk RAID 1 from scratch is as follows: .Pp @@ -108,7 +117,7 @@ Assemble the RAID volume: The console will show what device was added to the system: .Bd -literal -offset indent scsibus0 at softraid0: 1 targets -sd0 at scsibus0 targ 0 lun 0: <OPENBSD, SR RAID 1, 001> SCSI2 +sd0 at scsibus0 targ 0 lun 0: \*(LtOPENBSD, SR RAID 1, 001\*(Gt SCSI2 sd0: 1MB, 0 cyl, 255 head, 63 sec, 512 bytes/sec, 3714 sec total .Ed .Pp @@ -126,27 +135,13 @@ new RAID volume: .Ed .Pp The RAID volume is now ready to be used as a normal disk device. -.Pp See .Xr bioctl 8 for more information on configuration of RAID sets. -.Pp -All component partitions must be of type -.Dv RAID . -Some platforms, such as SUN, are not capable of using the -.Dv RAID -partition type. -The -.Dv 4.2BSD -partition type should be used on such platforms. .Sh SEE ALSO -.Xr sd 4 , -.Xr wd 4 , .Xr bioctl 8 , -.Xr config 8 , -.Xr fsck 8 , -.Xr MAKEDEV 8 , -.Xr mount 8 , +.Xr disklabel 8 , +.Xr fdisk 8 , .Xr newfs 8 .Sh HISTORY The |