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I am running Windows 2008R2 as KVM guest on Ubuntu 12.04 hypervisor. Disk
controller and network card are virtio devices with drivers from
https://launchpad.net/kvm-guest-drivers-windows/+download
(virtio-win-drivers-20120712-1.iso).
Everything worked fine until I changed disk controller cache from the default
(writethrough) to writeback. This introduced occasional blue screens. I noticed
that they are linked to high disk IO. For example restoring over 1GB of backup
files will results in a blue screen on around 4 out of 5 attempts. Also Windows
update crashes the system sometimes. When idle the system will run fine for
hours or sometimes even days.
After removing cache='writeback' from the config everything came back to normal.
qemu-kvm:
Installed: 1.0+noroms-0ubuntu14.8
Candidate: 1.0+noroms-0ubuntu14.8
Version table:
*** 1.0+noroms-0ubuntu14.8 0
500 http://archive.ubuntu.com/ubuntu/ precise-updates/main amd64
Packages
100 /var/lib/dpkg/status
1.0+noroms-0ubuntu14.7 0
500 http://security.ubuntu.com/ubuntu/ precise-security/main amd64
Packages
1.0+noroms-0ubuntu13 0
500 http://archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
** Affects: qemu (Ubuntu)
Importance: Undecided
Status: New
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Blue screen when disk uses cache='writeback'
https://bugs.launchpad.net/bugs/1201447
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