Hi all, I had a few questions about snapshot support in Cinder: 1) a. Why is a snapshot a fundamentally different entity than a volume? b. Is it because some back-ends don't support the same set of operations on snapshots? c. Is this what the snapshot-to-volume operation was meant to achieve? d. If a back-end supports nested snapshots, each snapshot will need to be converted to volume before a nested snapshot can be taken? e. And in this case, will the back-end driver simply do nothing for the snapshot-to-volume operation? 2) Why can't you take snapshots of attached volumes? I think most/all back-ends will be fine with it (of course they will be crash-consistent if the OS/application doesn't sync to disk). 3) Most back-ends support various types of snapshots - e.g., read-only, read-write, full copy, etc. How can we better support this notion?
Thanks, Avishay _______________________________________________ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp
