Vadim is the owner of virtio-block Windows driver. He will try to help you.
Best regards,
Yan.
On Mar 23, 2012, at 7:32 PM, Paul Fisher wrote:
Dear Yan,
We seem to be having some trouble with virtio disk on Windows Server 2008 R2 running on qemu-kvm. Essentially, when disk IO is stressed, it seems to blue screen.* Hosts have linux kernel 3.2.2, 64 bit, AMD Opteron 6128
These are potentially contended disks, since it's public cloud with multiple customers on the host - the issue could be connected to contention making disk response slow?
Pertinent facts:
* qemu-kvm 1.0
* VM is Windows Server 2008 R2, 64 bit - all patches downloaded from MS
* Virtio disk drivers are the February 2012 release .2200. Problem is apparent with the older .2000 driver as well.
* Blue screen shows failure in viostor.sys - screen cap and minidump are at http://dl.dropbox.com/u/12332019/2200BSOD.zip* qemu-kvm command line:
* Replication: Yes. Easily. In this case I stressed the disk by running Crystal Disk mark (a free IO measuring tool). When it got to the 4 KB random seek tests - I think it was on write - it would consistently blue screen.
* If it would help, I can provide remote access to this virtual machine if you wish - it's in our cloud system.
qemu-kvm -m MEMORY -smp SMP -cpu host -nodefaults -vga cirrus -vnc :1 -drive if=none,id=block.0,format=raw, cache=writeback,file=drive.img -device virtio-blk-pci,bootindex=1,drive=block.0 -monitor stdio
Any help would be greatly appreciated.
Regards,
Paul Fisher
Operations Manager
ElasticHosts Ltd