On 04.08.2010, at 18:46, Anthony Liguori wrote: > On 08/04/2010 11:44 AM, Avi Kivity wrote: >> On 08/04/2010 03:53 PM, Anthony Liguori wrote: >>> >>> So how do we enable support for more than 20 disks? I think a virtio-scsi >>> is inevitable.. >> >> Not only for large numbers of disks, also for JBOD performance. If you have >> one queue per disk you'll have low queue depths and high interrupt rates. >> Aggregating many spindles into a single queue is important for reducing >> overhead. > > Right, the only question is, to you inject your own bus or do you just reuse > SCSI. On the surface, it seems like reusing SCSI has a significant number of > advantages. For instance, without changing the guest's drivers, we can > implement PV cdroms or PC tape drivers.
What exactly would keep us from doing that with virtio-blk? I thought that supports scsi commands already. Alex
