Re: Better to use iSCSI on host or guest?

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On 6/14/11, Avi Kivity <avi@xxxxxxxxxx> wrote:
> My gut feeling is to do iscsi in the host.  I guess it's best to measure
> though.  Please post your findings if you do that.

Any suggestions or recommendations as to how/what should I be measuring with?

So far in trying to determine how bad is the qcow2 disk bottleneck on
my VMs, I've been using dd with dsync and direct options as well as
hdparm which errors out (not sure if this is considered a KVM/virtio
bug?) on the virtio disk after getting a buffered result.

But these don't seem to be very good tools since it's all sequential
only. I've tried iozone on my home machine but it takes too long per
run; unfortunately this host and its VMs are live and I don't have the
luxury of another full set of hardware to test on.
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