A while ago, Nathaniel W. Turner suggested:
# modprobe dm-snapshot
This indeed cures this particular problem for me.
To be more precise, here is what I did:
* I have added a line saying "dm-snapshot" to /etc/modules
* and, as I have root on LVM, also to /etc/mkinitrd/modules,
* I have generated afresh, in my case, /boot/initrd.img-2.6.8-1-686,
* I have updated my volumn group from LVM 1 to LVM 2
As a result, I can now use snapshots for the volumn that contains /usr and also the one that contains /home. Fine.
I still cannot cleanly create a snapshot for the root volume (which also contains /etc and /var). The machine freezes up when I try. But that's a different problem, I'll file a separate bug for that.
Again thank you, Nathaniel, for providing this hint.
There is a bug in LVM2 already that addresses the issue of dm-snapshot in /etc/modules:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=283507
I'm not sure the loading of dm-snapshot for the root LVM device at initrd-time is currently being addressed. Maybe this bug should be moved to initrd-tools?
Again, thank you Nathaniel, for providing that hint.
Andreas
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