[libvirt] [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions

[Anthony Liguori]

On 11/10/2011 02:06 PM, Daniel P. Berrange wrote:
> On Thu, Nov 10, 2011 at 01:11:42PM -0600, Anthony Liguori wrote:
>> On 11/10/2011 12:42 PM, Daniel P. Berrange wrote:
>>> On Thu, Nov 10, 2011 at 12:27:30PM -0600, Anthony Liguori wrote:
>>>> What does libvirt actually do in the monitor prior to migration
>>>> completing on the destination?  The least invasive way of doing
>>>> delayed open of block devices is probably to make -incoming create a
>>>> monitor and run a main loop before the block devices (and full
>>>> device model) is initialized.  Since this isolates the changes
>>>> strictly to migration, I'd feel okay doing this for 1.0 (although it
>>>> might need to be in the stable branch).
>>>
>>> The way migration works with libvirt wrt QEMU interactions is now
>>> as follows
>>>
>>>   1. Destination.
>>>         Run   qemu -incoming ...args...
>>>         Query chardevs via monitor
>>>         Query vCPU threads via monitor
>>>         Set disk / vnc passwords
>>
>> Since RHEL carries Juan's patch, and Juan's patch doesn't handle
>> disk passwords gracefully, how does libvirt cope with that?
>
> No idea, that's the first I've heard of any patch that causes
> problems with passwords in QEMU.

My guess is that migration with a password protected qcow2 file isn't a common 
test-case.

Regards,

Anthony Liguori

>
> Daniel