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From Mike Tutkowski <mike.tutkow...@solidfire.com>
Subject Re: Question about volume snapshots
Date Thu, 28 Aug 2014 19:57:44 GMT
Thanks, Chris

So, ideally, I would write a snapshot strategy and interrogate in the
incoming volume, make sure it's one of mine, then return that I can handle
reverting.

If it's not one of mine, I can run the default logic that's provided from
the class my strategy extends.

Sounds about right?


On Thu, Aug 28, 2014 at 1:42 PM, Chris Suich <csuich2@gmail.com> wrote:

> Hey Mike - I can provide a bit of background here. When working on my
> snapshot strategy, we knew that reverting single volumes was possible, but
> recognized that it may not be for all storage vendors or hypervisors (since
> hypervisors essentially have their own snapshot strategy). Additionally,
> some hypervisors (such as XenServer, IIRC) do not recommend reverting
> individual volumes, although it is possible - they recommend making a new
> volume from the snapshot and replacing the old volume with the new one.
>
> The revert button will only show up if the snapshot strategy reports that
> it can handle reverting the volume.
>
>
> On Thu, Aug 28, 2014 at 2:20 AM, Mike Tutkowski <
> mike.tutkowski@solidfire.com> wrote:
>
> > For those who are interested in this, it appears you have to write a
> > SnapshotStrategy implementation and override the canHandle method (this
> is
> > the default implementation, which is provided by the
> > XenserverSnapshotStrategy class):
> >
> >     @Override
> >
> >     public StrategyPriority canHandle(Snapshot snapshot,
> SnapshotOperation
> > op) {
> >
> >         if (op == SnapshotOperation.REVERT) {
> >
> >             return StrategyPriority.CANT_HANDLE;
> >
> >         }
> >
> >
> >         return StrategyPriority.DEFAULT;
> >
> >     }
> >
> > That being the case, the revert button won't show up under "standard"
> > operation.
> >
> >
> > On Thu, Aug 28, 2014 at 12:12 AM, Mike Tutkowski <
> > mike.tutkowski@solidfire.com> wrote:
> >
> > > Actually, it looks like you can revert a volume to a snapshot, if the
> > > underlying storage supports such an operation.
> > >
> > > I hadn't been explicitly setting this "revertable" field and it appears
> > to
> > > default to "false" and the GUI then doesn't show the button.
> > >
> > >
> > > On Wed, Aug 27, 2014 at 11:55 PM, Mike Tutkowski <
> > > mike.tutkowski@solidfire.com> wrote:
> > >
> > >> Hi,
> > >>
> > >> Under the Storage tab in the GUI, we can take a snapshot of a volume
> > >> (assuming the underlying storage plug-in supports that operation).
> > >>
> > >> When I examine the options of the created snapshots, I see the
> snapshot
> > >> can be deleted (as you'd expect), but I don't see a "revert volume to
> > >> snapshot" option.
> > >>
> > >> Can someone tell me what the history is behind that? Is it intentional
> > >> that the only way a volume snapshot (really a backup) can be utilized
> > is by
> > >> creating a template or a volume from it?
> > >>
> > >> Thanks!
> > >>
> > >> --
> > >> *Mike Tutkowski*
> > >>  *Senior CloudStack Developer, SolidFire Inc.*
> > >> e: mike.tutkowski@solidfire.com
> > >> o: 303.746.7302
> > >> Advancing the way the world uses the cloud
> > >> <http://solidfire.com/solution/overview/?video=play>*(tm)*
> > >>
> > >
> > >
> > >
> > > --
> > > *Mike Tutkowski*
> > > *Senior CloudStack Developer, SolidFire Inc.*
> > > e: mike.tutkowski@solidfire.com
> > > o: 303.746.7302
> > > Advancing the way the world uses the cloud
> > > <http://solidfire.com/solution/overview/?video=play>*(tm)*
> > >
> >
> >
> >
> > --
> > *Mike Tutkowski*
> > *Senior CloudStack Developer, SolidFire Inc.*
> > e: mike.tutkowski@solidfire.com
> > o: 303.746.7302
> > Advancing the way the world uses the cloud
> > <http://solidfire.com/solution/overview/?video=play>*(tm)*
> >
>
>
>
> --
> Chris Suich
> 919-334-8193
> csuich2@gmail.com
>



-- 
*Mike Tutkowski*
*Senior CloudStack Developer, SolidFire Inc.*
e: mike.tutkowski@solidfire.com
o: 303.746.7302
Advancing the way the world uses the cloud
<http://solidfire.com/solution/overview/?video=play>*™*

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