[libvirt] problem attaching/detaching disk

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 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