On 11/09/2012 01:32 PM, Cláudio Martins wrote:
On Thu, 8 Nov 2012 09:30:55 -0800 (PST) Sage Weil <sage@xxxxxxxxxxx> wrote:Lots of different snapshots: - librados lets you do 'selfmanaged snaps' in its API, which let an application control which snapshots apply to which objects. - you can create a 'pool' snapshot on an entire librados pool. this cannot be used at the same time as rbd, fs, or the above 'selfmanaged' snaps.Could you please clarify this? You mean that if a given pool has a snapshot created, a subsequent 'rbd snap create' on an image placed in that very same pool would fail?
Yes, if you create a pool-wide snapshot, 'rbd snap create' in that pool would fail. This explains a little about how these work at the rados level: https://github.com/ceph/ceph/blob/master/src/include/rados/librados.h#L664
A quick search through the RADOS and RBD documentation didn't turn anything up about this restriction, but I apologize if I missed it. Thanks Cláudio
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