Re: [Qemu-devel] [PATCH] Stop VM on ENOSPC error

[Jamie Lokier]

Gleb Natapov wrote:
> On Wed, Jan 14, 2009 at 04:47:17PM +0000, Jamie Lokier wrote:
> > Gleb Natapov wrote:
> > > And repeat last IDE command after VM restart.
> > 
> > If there are multiple AIOs in flight when you get ENOSPC, you may need
> > to repeat all of them.
> > 
> IDE does not support multiple outstanding commands. For SCSI that will have
> to be done though. What my patch is missing is PIO mode support, but this
> should be easy to add.

For some reason I imagined IDE with TCQ(sp?), or SATA with NCQ :-)

What about multiple IDE controllers.  If the VM is stopped (for any
reason, not just ENOSPC) and resumed later, do _other_ controllers'
AIOs in flight need to be replayed?  Are they saved in snapshot state?

-- Jamie