>
>This is partly due to the rollback abilities of each type of storage. Some
>types can't revert to several snapshots back without losing the more recent
>snapshots. This means that Cinder would still think there are snapshots

BTW, do we have counted which drivers can't / can revert to several snapshots
back without losing the more recent snapshots?

>available, but those snapshots would no longer be present on the storage
>device.
>
>This is considered a data loss condition, so we need to protect against that
>from happening. It's been discussed several times at Design Summits and PTGs,
>and at least so far there has not been a good way to handle it.
>
>The best recommendation we can give is for anyone that needs to go back several
>snapshots, you will need to revert one snapshot at a time to get back to where
>you need to be.
>
>But it is also worth pointing out that snapshots, and the ability to revert to
>snapshots, is not necessarily the best mechanism for data protection. If you
>need to have the ability to restore a volume back to its earlier state, using
>the backup/restore APIs are likely the more appropriate way to go.
>
>Sean