On Tue, 8 Apr 2008, Jess Bromley wrote:
> I've got a situation where I want to mirror only a partition of a
> physical disk on to that of another physical disk, not the whole disk;
> so software/hardware RAID isn't an option.
That is exactly what software RAID does for you - mirrors a partition.
LVM mirroring allows you to mirror a logical volume.
Here is an example status of partitions mirrored via software raid1:
$ cat /proc/mdstat
Personalities : [raid1]
read_ahead 1024 sectors
md0 : active raid1 hda3[0] hdc3[1]
530048 blocks [2/2] [UU]
md2 : active raid1 hda5[0] hdc2[1]
18916032 blocks [2/2] [UU]
md1 : active raid1 hda2[0] hdc1[1]
24000 blocks [2/2] [UU]
unused devices: <none>
You then make PVs on the mds if you want LVM. For example (another system):
# pvs
PV VG Fmt Attr PSize PFree
/dev/md2 rootvg lvm2 a- 36.19G 15.69G
/dev/md3 rootvg lvm2 a- 55.88G 2.00G
/dev/md4 rootvg lvm2 a- 55.88G 6.50G
/dev/md5 rootvg lvm2 a- 83.81G 23.81G
--
Stuart D. Gathman <stuart@bmsi.com>
Business Management Systems Inc. Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flammis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.
_______________________________________________
linux-lvm mailing list
linux-lvm@redhat.com
https://www.redhat.com/mailman/listinfo/linux-lvm
read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
