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From Mike Tutkowski <mike.tutkow...@solidfire.com>
Subject Re: Question regarding Quiesce VM feature in ACS 4.3 wrt XEN hypervisor
Date Wed, 16 Jul 2014 14:13:19 GMT
This line at the bottom of my previous e-mail was redundant...I meant to
remove it before sending:

A vendor snapshot can be created of the hypervisor snapshot file, then CS
can automatically delete


On Wed, Jul 16, 2014 at 8:10 AM, Mike Tutkowski <
mike.tutkowski@solidfire.com> wrote:

> I believe this is what happens:
>
> * The VM gets quiesced.
> * Hypervisor snapshots are taken of all VM disks (so a new delta file
> shows up on each applicable SR).
> * The applicable storage plug-in can be invoked to take a vendor-specific
> snapshot of a given hypervisor snapshot delta file.
> * Once the storage plug-in is done, CS can delete the hypervisor snapshot
> delta file(s) that was/were created.
>
> A couple notes about this:
>
> * Since you are taking a vendor-side snap of a particular file, this
> relates to NFS.
>
> * I believe all disks of the VM need to be supported by the same storage
> vendor (i.e. if the root and data disks are on different SRs, each SR needs
> to be supported by the storage of the same backend vendor)
>
> A vendor snapshot can be created of the hypervisor snapshot file, then CS
> can automatically delete
>
> On Wednesday, July 16, 2014, Punith S <punith.s@cloudbyte.com> wrote:
>
>> hi,
>>
>> while i was referring the ACS 4.3 doc for VM snapshot,
>> i see a feature Quiesce VM supported only by vmware hypervisor if the
>> cloudstack default primary storage is used,
>> but it also mentions that Quiesce VM can be supported if you are using a
>> third party primary storage plugin, the quiesce operation is provided by
>> plugin implementation!
>>
>> is Quiesce VM is a limitation of  XEN hypervisor or is it not implemented
>> by xen agent in cloudstack ?
>>
>> how is third party primary storage plugin related to hypervisor feature ?
>>
>> --
>> regards,
>>
>> punith s
>> cloudbyte.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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