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From Mike Tutkowski <mike.tutkow...@solidfire.com>
Subject Re: Bug? Should we allow detaching volumes when VMs have snapshots
Date Tue, 05 Nov 2013 18:35:24 GMT
I assume 6 fails with VMware, as well?

Is Xen OK with 6?


On Tue, Nov 5, 2013 at 11:26 AM, SuichII, Christopher <
Chris.Suich@netapp.com> wrote:

> FWIW, after looking into this more with Xen, when the VM is restored in
> step 4, it simply no longer has the volume attached, so this appears to
> really be a VMWare issue. Any VMWare experts out there know how we can
> handle this?
>
> -Chris
> --
> Chris Suich
> chris.suich@netapp.com
> NetApp Software Engineer
> Data Center Platforms – Cloud Solutions
> Citrix, Cisco & Red Hat
>
> On Nov 5, 2013, at 1:05 PM, SuichII, Christopher <Chris.Suich@netapp.com>
> wrote:
>
> > We currently don’t allow volumes to be attached to VMs with snapshots
> and allowing volumes to be detached causes quite a bug:
> >
> > 1) Attach a data disk to a VM
> > 2) Snapshot the VM
> > 3) Detach the data disk
> > 4) Attempt to restore the VM from the snapshot — FAILS since the data
> disk is no longer there, although it is expected to be
> > 5) Attempt to re-attach the volume to the VM — FAILS since you cannot
> attach volumes to VMs with snapshots
> > 6) Attempt to delete the VM snapshot — FAILS since the data disk is no
> longer there, although it is expected to be
> >
> > I have verified the above steps on VMWare, however Xen does not appear
> to fail on step 4, presumably because VMWare handles snapshots quite
> differently than Xen.
> >
> > Does anyone else have any thoughts on whether this is a bug or not? IMO,
> on VMWare, this set of steps can get users into a state where they can no
> longer attach new data disks to their VM, so it appears to be a bug of some
> kind.
> >
> > -Chris
> > --
> > Chris Suich
> > chris.suich@netapp.com
> > NetApp Software Engineer
> > Data Center Platforms – Cloud Solutions
> > Citrix, Cisco & Red Hat
> >
>
>


-- 
*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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