Re: Win2003 disk corruption with kvm-1.0. and virtio

[Sylvain Bauza <sylvain.bauza@digimind.com>]

Hi,
Latest updates, I tried using :
  - cache=writethrough / kvm-1.0 : errors in qcow2
  - cache=none/kvm-1.3 : no errors using 'qemu-img check', but 
EventViewer is complaining

I have to admit I'm lost. I cannot understand what is causing this 
corruption, only appearing on some Windows instances...
Please find below the executable path :
117      13781     1  4 Feb13 ?        00:41:43 /usr/bin/kvm -S -M 
pc-1.3 -enable-kvm -m 2048 -smp 1,sockets=1,cores=1,threads=1 -name 
instance-0000004f -uuid 26801166-aa03-4bbc-b062-da47168a664c 
-nodefconfig -nodefaults -chardev 
socket,id=charmonitor,path=/var/lib/libvirt/qemu/instance-0000004f.monitor,server,nowait 
-mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc 
-no-shutdown -boot c -drive 
file=/var/lib/nova/instances/instance-0000004f/disk,if=none,id=drive-virtio-disk0,format=qcow2,cache=none 
-device 
virtio-blk-pci,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0 
-netdev tap,fd=21,id=hostnet0,vhost=on,vhostfd=22 -device 
virtio-net-pci,netdev=hostnet0,id=net0,mac=fa:16:3e:7a:a1:61,bus=pci.0,addr=0x3 
-chardev 
file,id=charserial0,path=/var/lib/nova/instances/instance-0000004f/console.log 
-device isa-serial,chardev=charserial0,id=serial0 -chardev 
pty,id=charserial1 -device isa-serial,chardev=charserial1,id=serial1 
-usb -device usb-tablet,id=input0 -vnc 192.168.1.155:2 -k fr -vga cirrus 
-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5

Last try, I googled and found that virtio network can be buggy. I will 
try to switch back to another driver and see.
By the way, all these Windows instances do have virtio SCSI drivers up 
to date.



Le 13/02/2013 08:21, Philipp Hahn a écrit :
> Hello,
>
> On Tuesday 12 February 2013 15:30:37 Sylvain Bauza wrote:
>> We currently run Openstack Essex hosts with KVM-1.0 (Ubuntu 12.04)
>> instances with qcow2,virtio,cache=none
> The default answer is to update your qemu-kvm version: 1.0 is very old, qemu-
> kvm is fully merged into upstream qemu, which is currently preparing its 1.4
> release.
> There have been many fixes to qemi and the qcow2 handling: I know of at least
> one serious problem not fixed up to qemu-1.1.
>
> Sincerely
> Philipp