Hello list,
I have a strange behaviour on my snapshots.
I got a Ubuntu Server 7.04 with LVM2 setup:
lvm> version
LVM version: 2.02.06 (2006-05-12)
Library version: 1.02.08 (2006-07-17)
Driver version: 4.11.0
I have two logical volumes I want to make snapshots of every night:
/dev/vg0/home with XFS
/dev/vg0/opt with XFS
These snapshots will be mounted read-only under /backup
So in principle the steps to achieve this should be:
- unmount the snapshot from yesterday (umount /backup/home)
- discard the snapshot from yesterday (lvremove -f
/dev/vg0/daily-snapshot-home)
- freeze the filesystem (xfs_freeze -f /dev/vg0/home)
- create the snapshot (lvcreate --snapshot --size 20G --name
daily-snap-home -v /dev/vg0/home)
- unfreeze the filesystem (xfs_freeze -u /dev/vg0/home)
- mount the new snapshot ro (mount -oro,nouuid
/dev/vg0/daily-snap-home /backup/home)
I wrote a script for that with some error checking too. But sometimes
this doesn't work. The problem seems to be that the snapshot isn't
removed even if "lvremove -f " sais it is removed. I got the following
error message when I then recreate the snapshot:
root@konrad:~# ./create-snapshot-home.sh
+ /sbin/lvs
LV VG Attr LSize Origin Snap% Move Log Copy%
daily-snap-home vg0 swi-ao 20.00G home 0.00
daily-snap-opt vg0 swi-ao 20.00G opt 0.08
home vg0 owi-ao 100.00G
opt vg0 owi-ao 100.00G
root vg0 -wi-ao 10.00G
video vg0 -wi-ao 800.00G
+ /bin/umount -f /backup/home
+ /sbin/lvdisplay
+ grep /dev/vg0/daily-snap-home
/dev/vg0/daily-snap-home [active]
LV Name /dev/vg0/daily-snap-home
+ [ 0 -eq 0 ]
+ [ -b /dev/mapper/vg0-daily--snap--home ]
+ /sbin/lvremove -f /dev/vg0/daily-snap-home
Logical volume "daily-snap-home" successfully removed
+ sleep 5
+ [ -b /dev/mapper/vg0-daily--snap--home ]
+ [ 0 -eq 0 ]
+ /usr/sbin/xfs_freeze -f /home
+ [ 0 -eq 0 ]
+ /sbin/lvcreate --snapshot --size 20G --name daily-snap-home -v
/dev/vg0/home
Setting chunksize to 16 sectors.
Finding volume group "vg0"
Archiving volume group "vg0" metadata (seqno 116).
Creating logical volume daily-snap-home
Creating volume group backup "/etc/lvm/backup/vg0" (seqno 117).
Found volume group "vg0"
Creating vg0-daily--snap--home
Loading vg0-daily--snap--home table
Resuming vg0-daily--snap--home (254:5)
Clearing start of logical volume "daily-snap-home"
Found volume group "vg0"
LV vg0/daily-snap-home in use: not deactivating
Couldn't deactivate new snapshot.
+ /usr/sbin/xfs_freeze -u /home
+ /bin/mount -oro,nouuid /dev/vg0/daily-snap-home /backup/home
mount: you must specify the filesystem type
I don't know why this happens. The script will work perfectly 3 out of 5
times. But sometimes it comes up with the error above.
Are my steps right in principle? Did I forget to do something before or
after removing?
Thanks and kind regards
--
Falko Zurell
Head of Application Management
/i-d media AG
Ohlauer Straße 43
D-10999 Berlin
Tel +49 (0)30 - 2 59 47 - 357
Fax +49 (0)30 - 2 59 47 - 471
www.idmedia.com
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