Hi all,
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 filesystems are:
/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,
Kai.
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