Control: severity -1 normal Control: tags -1 + moreinfo Thanks for your report. I'm afraid I don't really know for sure what might be causing this. I suspect that the root cause is probably a kernel bug, or perhaps simply the kernel's IO scheduler being poor.
Can you please provide your Xen domain config file(s) ? I would like to see your storage arrangements. What is the NFS server ? What exact command do you run ? Thanks, Ian.