> from above numbers it doesn't sound like storage node is the culprit - > 50% drop happens on compute node going from baremetal to virtual. So I'm > inclined to think it's a tuning of virtio (if that is even possible).
Some tuning tips for kvm: http://www.linux-kvm.org/page/Tuning_KVM We saw a major improvement using RAW vs QCOW2 (in theory this should be similar, however, when you need a high random IO throughput we did see major improvements in our setup with RAW) On more thing to check is partition alignment. (not very likely for a recent OS) Cheers, Robert van Leeuwen _______________________________________________ Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack Post to : [email protected] Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
