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authorJason McIntyre <jmc@cvs.openbsd.org>2009-04-29 07:02:03 +0000
committerJason McIntyre <jmc@cvs.openbsd.org>2009-04-29 07:02:03 +0000
commitab5a8cd69b2244b61e31a22a66a0d32f08c084b2 (patch)
treea7ba107919d19af33c338a286d785a5cd28dc7cb /share/man
parent28d9932de5b3b21cd2af2aa63dc273e53c09f55f (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.457
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