Accidental image deletion

Accidental image deletion

[Andrey Korolyov]

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.

Thanks!

Re: Accidental image deletion

[Josh Durgin]

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