virt-manager 0.8.7 (on 11.10) does not support virtio block serial numbers. If you even provide a serial number virt-manger will not start the VM guest.
Meanwhile I've confirmed that if you just edit libvirt with "virsh edit ..." to insert <serial>FOO</serial> and boot the VM with "virsh start ..." the /dev/disk/by-id of 11.04 guest on 11.04 host works: nutznboltz@grub-bug:~$ lsb_release -ds Ubuntu 11.04 nutznboltz@grub-bug:~$ uname -a Linux grub-bug 2.6.38-8-virtual #42-Ubuntu SMP Mon Apr 11 04:06:34 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux nutznboltz@grub-bug:~$ ls -l /dev/disk/by-id total 0 lrwxrwxrwx 1 root root 9 2011-06-17 11:04 ata-QEMU_DVD-ROM_QM00003 -> ../../sr0 lrwxrwxrwx 1 root root 9 2011-06-17 11:04 virtio-WD-NUTZ9A966149 -> ../../vda lrwxrwxrwx 1 root root 10 2011-06-17 11:04 virtio-WD-NUTZ9A966149-part1 -> ../../vda1 lrwxrwxrwx 1 root root 10 2011-06-17 11:04 virtio-WD-NUTZ9A966149-part2 -> ../../vda2 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/604335 Title: grub-pc.postinst script fails to detect virtio vda disk in KVM guest To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/604335/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
