Re: [Qemu-block] qemu exit with pending I/O

[Peter Lieven]

Am 27.04.2015 um 14:11 schrieb Paolo Bonzini:
> On 27/04/2015 13:51, Peter Lieven wrote:
> > > The reason to do this, is that while I/O is pending you do not know if
> > > the I/O has been completed or not.
> > But if I consider a raw image, quitting without a clean shutdown can
> > also leave an inconsistent state?
> But you know that all I/O submitted to disk has been handled.
>
> The bdrv_drain_all() avoids that some leftover I/O mysteriously pops up
> while another VM, or another instance of this VM, is using the image.
> That's much worse.

Can this happen with a raw image used by a single VM?

Would it be an option to have a quit command with lets call it "noflush" flag?

I consider the case that my storage has died. In the iSCSI case all vServers 
will
end up in the now async reconnect loop. In such a case I might need to 
terminate the
vServers and want to restart them later from a backup. It would be interesting 
to be able
to terminate the vServer with a command via hmp/qmp wihtout the need to send a 
SIGKILL
from external.

Peter