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

[Avi Kivity <avi@redhat.com>]

  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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