At 03/03/2011 02:11 PM, Shi Jin Write:
Hi there,
Attaching/detachnig virtio disk to a VM used to work fine with RHEL-5 but with RHEL-6 it seems to have problems.
Attaching seems to work. For example, I can do virsh attach-disk <vmname> <qcow2 file name> vdb --driver file --subdriver qcow2 However, it generates a bit weird XML: <disk type='file' device='disk'> <driver name='file' type='qcow2'/> <source file='<file>/> <target dev='vdb' bus='virtio'/> <alias name='virtio-disk1'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/> </disk>
In contrary, our original VM system disk has <disk type='file' device='disk'> <driver name='qemu' type='qcow2'/> <source file='<sys disk image>'/> <target dev='vda' bus='virtio'/> <alias name='virtio-disk0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </disk>
Note the different of driver name: qemu vs file. I think qemu is the proper name to use. This has been mentioned last year on this list [1]. I wonder if there has already been a proper fix for this problem.
More seriously about this is that I am not able to detach the just attached disk, most likely due to the problem of wrong driver name. [cloudadmin@test2 ~]$ virsh detach-disk one-52 vdb error: Failed to detach disk error: operation failed: detaching virtio-disk1 device failed: Device 'virtio-disk1' not found This error message is reported by qemu.
I try to reproduce this bug with upstream libvirt and qemu, but it works fine to me: # virsh attach-disk RHEL6RC /var/lib/libvirt/images/test3.img vdb --driver file --subdriver qcow2 Disk attached successfully # virsh detach-disk RHEL6RC vdb Disk detached successfully What is version of libvirt and qemu that you use?
But if I tried to remove the vda which uses qemu as driver name it would work. [cloudadmin@test2 ~]$ virsh detach-disk one-52 vda Disk detached successfully
I also tried with raw disks to attach/detach and saw the same problems.
Thank you very much. Shi
[1]: http://www.redhat.com/archives/libvir-list/2010-August/msg00449.html
-- Shi Jin, PhD
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