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. It also
supports SCSI level pass through which is pretty nice for enabling
things like NPIV.
Regards,
Anthony Liguori
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