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
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Shi Jin, PhD
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