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[cinder][dev] support-revert-to-any-snapshot


Hey Helen,

The NFS Generic driver relies on QEMU rollback/commit which in some cases
will  merge the intermediary snapshots, so you would loose them. I think
that there are others, really hard to tell, as looking at the code may not
reveal what some backends do internally and I'm pretty sure not all backend
maintainers will promptly inform if they support or not.

Erlon

Em qua, 17 de abr de 2019 às 05:56, Walsh, Helen <Helen.Walsh at dell.com>
escreveu:

>
>
> To cinder driver developers:
>
>
>
> ·
> https://blueprints.launchpad.net/cinder/+spec/support-revert-to-any-snapshot
>
>
>
> In relation to the blueprint above.  I am wondering if there are any
> drivers that whose later snapshots will not be valid after a revert to an
> snapshot that is NOT the last in the series
>
>
>
>                                                               Vol1
>
>                                                                  \
>
> -----------------------------------------------------
>
> Mon        Tue          Wed       Thu           Fri
>
>    \              \                 \                \              \
>
>     S1 -------- S2 ---------S3 -------- S4 ---------S5
>
>
>
>
>
> If on Fri, I was to revert back to Tuesdayâ??s Snapshot S2, would S3, S4 and
> S5 still be usable Snapshots?
>
>
>
>
>
>              Vol1
>
>                 \
>
> -----------------------------------------------------
>
> Mon        Tue          Wed       Thu           Fri
>
>    \              \                 \                \              \
>
>     S1 -------- S2 ---------S3 -------- S4 ---------S5
>
>
>
> Thank you,
>
> Helen
>
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