Hi All, I have a cluster of three nodes set up. Live migration is accomplished via an NFS mount over 10GigE shared by all three nodes.
I have noticed that when a VM is brand new I am getting close to 60MB/s disk write when using "dd if=/dev/zero of=file bs=1M count=1k conv=fdatasync". after doing this 10s of times the perfomance of the disk seems to drop to around 4 - 12 MB/s. I have also noticed that doing a live-migration causes a similar effect immediately. Here is the virsh xml output of one of my VMs: https://gist.github.com/swinchen/397fbe3bb74305064944 I have read several "tuning" guides and most of the suggestions seems to be configured already (cache='none', virtio for network, disk and memballoon). Do you think qcow2 is causing my issue and if so is there a way to boot an instance and override the disk format? Thanks, Sam
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