LVM2 Snapshots on / hang machine
k_leibrandt at hotmail.com
Thu Oct 14 20:51:19 UTC 2004
I am not sure if this should even be possible, but in order to take
consistent backups I would like to take snapshots of my / filesystem, and
then use dump for the backup, but taking a snapshot of / consistently hangs
my machine. My box is Fedora Core 2, kernel 2.6.8-1.521, lvm2-2.00.15-2, the
/boot: ext3 on /dev/md0
/: ext3 on /dev/VG00/RootLV on /dev/md1
/export: ext3 on /dev/VG00/ExportLV on /dev/md1
swap: swap on /dev/VG00/SwapLV on /dev/md1
VG00 has 500Mb free, and the snapshots I create are of the right size
(lvcreate -L500M -s -n BackupLV /dev/VG00/ExportLV for instance). Taking
snapshots on /export is fine, and I have done some stress testing on this,
repeatedly creating snapshots, dumping the snapshot to file, removing
snapshot, etc. As soon as I create a snapshot on / however, the machine
hangs, although X still works (well, the mouse still moves), it is no longer
possible to open a new shell, switch consoles, or even <CTRL>C the lvcreate.
I have tried this with ext2 as well as with xfs, including doing xfs_freeze
before taking the snapshot, so I don't think it's a filesys related matter.
Is there anything I am missing here? Is it even supported to do / snapshots?
Many thanks for any help,
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