Yep - exactly. In fact, all of the snapshot strategies are loaded when the
server starts. I forget what the interface looks like, exactly, but there
are methods that let you respond to whether you can handle all different
kinds of operations on a volume.
On Thu, Aug 28, 2014 at 4:01 PM, Mike Tutkowski <
mike.tutkow...@solidfire.com> wrote:
> I assume CloudStack allows for multiple snapshot strategies to be loaded at
> the same time? That way different vendors can provide their own unique ones
> and handle their own volumes (if the default strategy isn't desired).
>
>
> On Thu, Aug 28, 2014 at 1:57 PM, Mike Tutkowski <
> mike.tutkow...@solidfire.com> wrote:
>
> > 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 <csui...@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.tutkow...@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.tutkow...@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.tutkow...@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.tutkow...@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.tutkow...@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.tutkow...@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
> >> csui...@gmail.com
> >>
> >
> >
> >
> > --
> > *Mike Tutkowski*
> > *Senior CloudStack Developer, SolidFire Inc.*
> > e: mike.tutkow...@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.tutkow...@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
csui...@gmail.com
