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From "SuichII, Christopher" <Chris.Su...@netapp.com>
Subject Re: Bug? Should we allow detaching volumes when VMs have snapshots
Date Wed, 06 Nov 2013 13:58:51 GMT
Bumping this. I believe we need the imput of a VMWare expert, please.

-Chris
-- 
Chris Suich
chris.suich@netapp.com
NetApp Software Engineer
Data Center Platforms – Cloud Solutions
Citrix, Cisco & Red Hat

On Nov 5, 2013, at 1:46 PM, Mike Tutkowski <mike.tutkowski@solidfire.com> wrote:

> OK, well, depending on if we can or can't get a VMware person to chime in
> on this issue, we may have to disallow disks from being detached from
> VMware VMs with snapshots in 4.3.
> 
> 
> On Tue, Nov 5, 2013 at 11:44 AM, SuichII, Christopher <
> Chris.Suich@netapp.com> wrote:
> 
>> Correct.
>> 
>> #6 FAILS with VMWare and SUCCEEDS with Xen
>> 
>> --
>> Chris Suich
>> chris.suich@netapp.com
>> NetApp Software Engineer
>> Data Center Platforms – Cloud Solutions
>> Citrix, Cisco & Red Hat
>> 
>> On Nov 5, 2013, at 1:35 PM, Mike Tutkowski <mike.tutkowski@solidfire.com>
>> wrote:
>> 
>>> 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>
>>> *™*
>> 
>> 
> 
> 
> -- 
> *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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