I have found 2 scenarios using FC4 (2.6.13-latest) that cause
700GB volume, create a snapshot of 100Gb, copy the snap to another
disk, remove the snapshot. The snapshot remove never ends it just hangs. One can
type lvscan, it will display a few LVs and then hang, press Ctrl-C to get out of
that. Ctrl-C does not work with lvremove. No /var/log/messages indicating
We believe this might happen because the volume copy takes about
8hours, however if I do a snap and then instantly remove it, it works fine.
The 8 hour time frame + plus moderate IO appears to be the problem.
Labtest: create a 20G volume, create a 8G
snap. From another terminal do dd if=/dev/zero of=/dev/vg/lv bs=1M, after
running for a few minutes remove the snapshot - it cannot be removed until ALL
IO ceases on the original volume.
I have tried the development FC4 2.6.14
kernel today and that causes the same problems. lvm2 tools: