Reducing logical volume

Submitted by sandip on Thu, 07/03/2008 - 09:56

I've had to reduce the logical volume that was alloted for mysql data from 8GB to 4GB, which was a breeze with e2fsadm available for lvm1 on RHEL-3 .

Stop the running serivces using the volume:

# service httpd stop
# service mysqld stop

e2fsadm will reduce the filesystem and then the logical volume.

# umount /mnt/lv-mysql
# e2fsadm -L -4G /dev/hdb2-vg00/lv-mysql
# mount /mnt/lv-mysql

Check with df, which should now show the new volume size:

$ df -h /mnt/lv-mysql
Filesystem              Size  Used Avail Use% Mounted on
/dev/hdb2-vg00/lv-mysql 4.0G  531M  3.3G  14% /mnt/lv-mysql

Start the running serivces using the volume:

# service httpd start
# service mysqld start

Note: e2fsadm is not available in lvm2 and will need to reduce in two steps:

1. Reduce the filesystem residing on the logical volume.
2. Reduce the logical volume.

# resize2fs /dev/vg0/lv0 4G
# lvreduce -L -4G /dev/vg0/lv0

Bookmark/Search this post with

See Also