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.
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 * Hosts have linux kernel 3.2.2, 64 bit, AMD Opteron 6128 * 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 * 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 command line: 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
