[CentOS] Consolidating LVM volumes..
theo.band at xanadu-wireless.com
Fri Mar 23 12:20:50 UTC 2007
> Something I haven't done before is reduce the number of volumes on my
> server.. Here is my current disk setup..
> [root at server1 /]# df -h
> Filesystem Size Used Avail Use% Mounted on
> 15G 1.5G 13G 11% /
> /dev/md0 190M 42M 139M 24% /boot
> 39G 16G 22G 42% /data
> none 157M 0 157M 0% /dev/shm
> 77G 58G 15G 80% /home
> 16G 382M 15G 3% /var
> Rather than try and reduce the size of the VarVol00 volume to make
> more unallocated space which I have heard is a little dangerous.. I
> would like to get rid of the VarVol00 and have the /var directory on
> the RootVol00 volume.. Then I can allocate some of the free space to
> HomeVol00 which is filling up..
> So how do I do this?
> Do I simply copy /var to /var2 and then edit the /etc/fstab file to
> remove the line that mounts VarVol00??
> Then at what point and how do I rename /var2 to /var to get it all
> working as normal again?
> Should this all be done in "single" mode?
It depends (as always). You need to unmount /var Perhaps this can be
done in single user mode. If not (some services still running that have
files open) than just use rescue mode.
# something like this:
rsync -av /var/ /var2
rmdir /var (it's probably empty)
mv /var2 /var
telinit 3 (or 5)
To my understanding sometimes it is possible to resize live ext3
filesystems. (No experience myself). In that case you could simply do
something like this:
resize2fs /dev/VolGroup00/VarVol00 2G
lvreduce -L2G /dev/VolGroup00/VarVol00
I would still prefer to do this when the disk is unmounted and checked
(e2fsck -f /dev/VolGroup00/VarVol00). But in that case you of course get
rid of the partition VarVol00 anyhow.
More information about the CentOS