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Try to catch up with device name changes due to GEOM'ification. Remove

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note about requirement of operating on 'c' partition, GEOM removed this.

Mention RAIDframe, don't mention DPT hardware RAID as a good alternative.
This commit is contained in:
obrien 2003-12-08 10:50:36 +00:00
parent 8b107990e3
commit 251c6ce8b9
1 changed files with 19 additions and 14 deletions
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33
sbin/ccdconfig/ccdconfig.8
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@ -119,7 +119,7 @@ argument is optional.
#
.Pp
# ccd ileave flags component devices
ccd0 16 none /dev/da2e /dev/da3e
ccd0 16 none /dev/da2s1 /dev/da3s1
.Ed
.Pp
The component devices need to name partitions of type
@ -139,17 +139,20 @@ are exactly the same as you might place in the
configuration file. The first example creates a 4-disk stripe out of
four scsi disk partitions. The stripe uses a 64 sector interleave.
The second example is an example of a complex stripe/mirror combination.
It reads as a two disk stripe of da2e and da3e which is mirrored
to a two disk stripe of da4e and da5e. The last example is a simple
mirror. /dev/da2e is mirrored with /dev/da4e and assigned to ccd0.
It reads as a two disk stripe of da4 and da5 which is mirrored
to a two disk stripe of da6 and da7. The last example is a simple
mirror. The 2nd slice of /dev/da8 is mirrored with the 3rd slice of /dev/da9
and assigned to ccd0.
.Pp
.Bd -unfilled -offset
# ccdconfig ccd0 64 none /dev/da2e /dev/da3e /dev/da4e /dev/da5e
# ccdconfig ccd0 128 CCDF_MIRROR /dev/da2e /dev/da3e /dev/da4e /dev/da5e
# ccdconfig ccd0 128 CCDF_MIRROR /dev/da2e /dev/da4e
# ccdconfig ccd0 64 none /dev/da0s1 /dev/da1s1 /dev/da2s1 /dev/da3s1
# ccdconfig ccd0 128 CCDF_MIRROR /dev/da4 /dev/da5 /dev/da6 /dev/da7
# ccdconfig ccd0 128 CCDF_MIRROR /dev/da8s2 /dev/da9s3
.Ed
.Pp
When you create a new ccd disk you generally want to
.Xr fdisk 8
and
.Xr disklabel 8
it before doing anything else. Once you create the initial label you can
edit it, adding additional partitions. The label itself takes up the first
@ -168,9 +171,8 @@ with offset 16 and size 9984.
# disklabel -e ccd0
.Ed
.Pp
The disklabeling of a ccd disk is usually a one-time affair. Unlike other
devices, ccd currently requires that you specify partition 'c' when
running disklabel. If you reboot the machine and reconfigure the ccd disk,
The disklabeling of a ccd disk is usually a one-time affair.
If you reboot the machine and reconfigure the ccd disk,
the disklabel you
had created before will still be there and not require reinitialization.
Beware that changing any ccd parameters: interleave, flags, or the
@ -186,9 +188,11 @@ This is a poor-man's mirroring implementation. It works well enough that if
you begin to get disk errors you should be able to backup the ccd disk,
replace the broken hardware, and then regenerate the ccd disk. If you need
more than this you should look into external hardware RAID SCSI boxes,
RAID controllers such as the
.Xr dpt 4
controller, or software RAID systems such as
RAID controllers (see GENERIC),
or software RAID systems such as
RAIDframe
.Xr raid 4
and
.Xr vinum 8 .
.Sh FILES
.Bl -tag -width /etc/ccd.conf -compact
@ -198,8 +202,9 @@ default ccd configuration file
.Sh SEE ALSO
.Xr dd 1 ,
.Xr ccd 4 ,
.Xr dpt 4 ,
.Xr raid 4 ,
.Xr disklabel 8 ,
.Xr fdisk 8 ,
.Xr rc 8 ,
.Xr vinum 8
.Sh BUGS