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I already had increased my snapshot volume size to 12 GiB before. Now I've dumped the LV stats each second, until it hangs. The last output from lvdisplay is: # open 1 LV Size 40.00 GiB Current LE 10240 COW-table size 12.00 GiB COW-table LE...

I've run into a very similar problem during stress-testing a W2k8 guest. If a backup is done while running iozone in the guest, the backup task hangs when it tries to remove the snapshot volume with "lvremove". When idle, the same guest can be backed up without any problems. In my setup the...