[linux-lvm] snapshot on 6.8.5/FC development

Gunnar Hilling fedora.gunnar at hilling.de
Thu Sep 16 00:56:27 UTC 2004


I just tried the lvm2/dm-snapshot feature and failed miserably...
After reading some older postings in this and the dm-devel mailing lists
I'm not sure what to do:


VG-Size: 4G on Raid-Mirror (/dev/md1)
LV-Size: 1G


lvcreate --snapshot --size 100m --name snap /dev/TestMirrorGroup/OnlineVol

will block forever. I have to reboot the computer. After
that /dev/TestMirrorGroup/snap is there...

I froze xfs before (xfs_freeze -f)

Any Clue? Is this related to xfs-FS only or do there exist general
problems (I read somewhere about problems snapshotting raids...)

BTW: Why isn't it possible to create the snapshot on another VG than the
original. This would be quite nice becauce in a typical setup it could
be an advantate to have the snapshot on a small extra disk, keeping the
original data separated from the writes to the snapshot.

Any help appreciated,


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