Thanks for the answer.
I'm not an expert on this, but here is what I would try:
- Are you using the latest virtio drivers on your Windows guest(s)? http://alt.fedoraproject.org/pub/alt/virtio-win/latest/images/
Yes, this version is used
- Is there any particular reason you use CentOS 6.4 on your storage
server? I would update it to CentOS 6.5 so you would have matching Linux kernels on both of your systems.
OK, will try and schedule the maintenance, but when it was 6.4 everywhere - all was the same.
Zoltan