Re: [Qemu-devel] Re: KVM call agenda for Oct 19

Avi Kivity
2010-10-19T12:56:07Z

On 10/19/2010 02:48 PM, Dor Laor wrote:
> On 10/19/2010 04:11 AM, Chris Wright wrote:
>> * Juan Quintela (quintela@redhat.com) wrote:
>>>
>>> Please send in any agenda items you are interested in covering.
>>
>> - 0.13.X -stable handoff
>> - 0.14 planning
>> - threadlet work
>> - virtfs proposals
>>
>
> - Live snapshots
> - We were asked to add this feature for external qcow2
> images. Will simple approach of fsync + tracking each requested
> backing file (it can be per vDisk) and re-open the new image would
> be accepted?
> - Integration with FS freeze for consistent guest app snapshot
> Many apps do not sync their ram state to disk correctly or frequent
> enough. Physical world backup software calls fs freeze on xfs and
> VSS for windows to make the backup consistent.
> In order to integrated this with live snapshots we need a guest
> agent to trigger the guest fs freeze.
> We can either have qemu communicate with the agent directly through
> virtio-serial or have a mgmt daemon use virtio-serial to
> communicate with the guest in addition to QMP messages about the
> live snapshot state.
> Preferences? The first solution complicates qemu while the second
> complicates mgmt.

Third option, make the freeze path management -> qemu -> virtio-blk ->
guest kernel -> file systems. The advantage is that it's easy to
associate file systems with a block device this way.

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