[sheepdog] [libvirt] Why not add snapshot operations for Sheepdog storage driver in Libvirt
eblake at redhat.com
Fri Feb 8 13:56:35 CET 2013
On 02/08/2013 04:56 AM, harryxiyou wrote:
> Hi all,
> Virsh has following operations about snapshot.
> Snapshot (help keyword 'snapshot')
> snapshot-create Create a snapshot from XML
> snapshot-create-as Create a snapshot from a set of args
> snapshot-current Get or set the current snapshot
> snapshot-delete Delete a domain snapshot
> snapshot-dumpxml Dump XML for a domain snapshot
> snapshot-edit edit XML for a snapshot
> snapshot-info snapshot information
> snapshot-list List snapshots for a domain
> snapshot-parent Get the name of the parent of a snapshot
> snapshot-revert Revert a domain to a snapshot
These commands are related to domain snapshots.
> But i cannot find relevant realization in Sheepdog storage driver in Libvirt.
That would be a storage volume snapshot, which is a different task.
Remember, a domain snapshot may include storage volume snapshots, and
may also include memory state snapshots, which makes it a more
comprehensive task; but also that some of the work of a domain snapshot
is offloaded to qemu, whereas storage volume snapshot manipulation would
have to be done in libvirt independently of qemu. At one point I
proposed API for doing storage volume snapshot manipulation, but it
never became a pressing need, so no one has implemented it yet.
> I am sure Sheepdog storage driver, now, cannot support snapshot operations
> in Libvirt. I wonder whether Sheepdog can realize snapshot operations
> in Libvirt?
Not just sheepdog, but qcow2 storage volume management would also
benefit from storage volume snapshot commands.
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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