On 10/22/2011 06:00 PM, Dennis Jacobfeuerborn wrote: > Running iostat shows no I/O activity when running the tests for /dev/vdb > which explains the insane numbers. The question is why I get such different > results when both devices are defined exactly the same way? I'm not very familiar with KVM yet (got my first real lesson today), but I notice you said: "In the guest the drive are running using virtio with type=raw and cache=none." Are these KVM settings, or did you use kernel parameters on the guest machine? Also, what about the elevator (i/o scheduler) in the guest? In a VMware Server2 host (on Centos, so I'm not far OT) it's best to use the elevator=noop parameter. I wouldn't expect the elevator to skew results quite as much as you're seeing, but what do I know? ;) -- -Eric 'shubes' _______________________________________________ CentOS-virt mailing list CentOS-virt@xxxxxxxxxx http://lists.centos.org/mailman/listinfo/centos-virt
