On 04/07/2013 01:31 PM, Andrey Korolyov wrote:
Hello,
Is there an existing or planned way to save an image from such thing,
except protected snapshot? Since ``rbd snap protect'' is good enough
for a small or inactive images, large ones may add significant overhead
by space or by I/O when 'locking' snapshot is present, so it would be nice
to see same functionality by the flag of ``rbd lock'' command.
When we added locking originally, we thought about adding a general
--lock flag for rbd commands on a particular image that would acquire
an exclusive lock on the image before doing anything.
Then you could do 'rbd rm --lock', and it would fail if you'd left the
imaged locked. This is easy to implement, but we haven't gotten around
to it. It's in the tracker though: http://tracker.ceph.com/issues/2586
On a related note, Wido is adding an option to prevent accidental data
loss via resize: https://github.com/ceph/ceph/pull/209
Josh
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