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From Mike Tutkowski <>
Subject Re: Question regarding Quiesce VM feature in ACS 4.3 wrt XEN hypervisor
Date Wed, 16 Jul 2014 14:10:44 GMT
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 <> 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

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