LVM stuff

[Darin Perusich]

i use LVM in linux and solaris for managing large file systems it's the 
way to go, though solaris has some goodies like soft-partitions that i 
think linux needs.

when using LVM you assiciate disks or partitions with a volume group and 
create logical volumes within the group. the logical volumes are what 
you make you file systems on and mount. for the purposes for backup and 
restore you can use any utility that you'd use on a normal file system, 
dump/restore, tar, cpio, etc.

example time. you've placed /dev/hdb1 and /dev/hdc1, both 10gb into 
volume group named "system". with this group you might create 2 5gb 
logical volumes, 000 and 001 and make XFS files systems on each volume. 
you might them mount /dev/system/000 on /home and /dev/systems/001 on 
/exports. to dump the FS use 'xfsdump options /dev/system/000' if 000 is 
filling up you could extend the logical volume by adding /dev/hdc2 to it 
and growing the FS with xfs_growfs.

i hope this was what you where looking for.

Cyber Source wrote:
> Has anyone worked with LVM? FC3 by default uses LVM for partitions and 
> from what I have read so far, it looks to have many, many cool 
> advantages like striping partitions across different drives for volumes, 
> etc. My question is this, has anyone performed a dump/restore or 
> whatever would be the equivalent of this on an LVM partition? I have a 
> pretty decent howto on it that I found on the web where it seems to be 
> to just add the partition (dump) to the volume group and then remove the 
> original (restore). I am looking for methods to this because the way I 
> am reading this is, if you have say a /dev/hda1 in your original volume 
> group and then add /dev/hdb1, would you then have to remove anything, 
> since on the subsequent boot, your /dev/hdb1 would then become 
> /dev/hda1. I could see then having to remove /dev/hdb1, since it 
> wouldn't be there anymore, Anyway......any thoughts? Thanks

-- 
Darin Perusich
Unix Systems Administrator
Cognigen Corp.
darinper at cognigencorp.com