[libvirt] problem attaching/detaching disk

[Wen Congyang]

At 03/04/2011 01:36 PM, Shi Jin Write:
> Here is the command
> [root at test2 images]# virsh attach-disk 1 /var/lib/libvirt/images/disk.qcow2
>  vdb  --driver file --subdriver qcow2
> Disk attached successfully
> 
> Here is the log I found relevant (too much under debug mode)
> 15:31:52.902: debug : virEventInterruptLocked:668 : Interrupting
> 15:31:52.902: debug : qemuMonitorCommandWithHandler:235 : Receive command
> reply ret=0 errno=0 30 bytes 'unknown command: 'drive_add'^M
> '

It seems that your qemu does not support monitor command 'drive_add'.
What's version of your qemu?

> 15:31:52.902: debug : virEventRunOnce:595 : Poll got 1 event
> 15:31:52.902: debug : virEventDispatchTimeouts:405 : Dispatch 3
> 15:31:52.902: debug : qemuMonitorAddDevice:1878 : mon=0x7f3628341370
> device=virtio-blk-pci,bus=pci.0,addr=0x6,drive=drive-virtio-disk1,id=virtio-disk1

When 'drive_add' failes, we do not call qemuMonitorAddDevice(). But it is called.

> 15:31:52.902: debug : virEventDispatchHandles:450 : Dispatch 8
> 15:31:52.902: debug : qemuMonitorCommandWithHandler:230 : Send command
> 'device_add
> virtio-blk-pci,bus=pci.0,addr=0x6,drive=drive-virtio-disk1,id=virtio-disk1'
> for write with FD -1

What's the reply of command 'device_add'? Can you provide it. I think it should fail.

Thanks.
Wen Congyang

> 
> Than you very much.
> 
> Shi
> 
> 
> 
> 
> 
> On Thu, Mar 3, 2011 at 10:12 PM, Wen Congyang <wency at cn.fujitsu.com> wrote:
> 
>> At 03/04/2011 01:00 PM, Shi Jin Write:
>>>>
>>>>
>>>>
>>>>     <disk type='file' device='disk'>
>>>>       <driver name='qemu' type='qcow2' cache='none'/>
>>>>      <source file='/var/lib/libvirt/images/rhel6rc_64.img'/>
>>>>      <target dev='hda' bus='ide'/>
>>>>      <alias name='ide0-0-0'/>
>>>>      <address type='drive' controller='0' bus='0' unit='0'/>
>>>>    </disk>
>>>>    <disk type='file' device='cdrom'>
>>>>      <driver name='qemu' type='raw'/>
>>>>      <source file='/var/lib/libvirt/images/test.iso'/>
>>>>      <target dev='hdc' bus='ide'/>
>>>>      <readonly/>
>>>>      <alias name='ide0-1-0'/>
>>>>      <address type='drive' controller='0' bus='1' unit='0'/>
>>>>    </disk>
>>>>     <disk type='file' device='disk'>
>>>>      <driver name='file' type='qcow2'/>
>>>>       <source file='/var/lib/libvirt/images/test3.img'/>
>>>>       <target dev='vdb' bus='virtio'/>
>>>>       <alias name='virtio-disk1'/>
>>>>      <address type='pci' domain='0x0000' bus='0x00' slot='0x06'
>>>> function='0x0'/>
>>>>    </disk>
>>>>    <controller type='ide' index='0'>
>>>>      <alias name='ide0'/>
>>>>      <address type='pci' domain='0x0000' bus='0x00' slot='0x01'
>>>> function='0x1'/>
>>>>    </controller>
>>>>
>>>>
>>>> Thank you very much. It is exactly the same output as mine, particularly
>>>  <driver name='file' type='qcow2'/>
>>> I thought it has to be name='qemu' to detach properly but since you
>> didn't
>>> have a problem, I am very lost on why mine didn't work.
>>>
>>> My libvirtd.log shows (with debugging turned on)
>>> 14:43:18.965: debug : qemuMonitorCommandWithHandler:235 : Receive command
>>> reply ret=0 errno=0 33 bytes 'Device 'virtio-disk1' not found^M
>>> '
>>> 14:43:18.965: debug : virEventDispatchTimeouts:405 : Dispatch 3
>>> 14:43:18.965: debug : virEventDispatchHandles:450 : Dispatch 8
>>> 14:43:18.965: error : qemuMonitorTextDelDevice:2314 : operation failed:
>>> detaching virtio-disk1 device failed: Device 'virtio-disk1' not found^M
>>>
>>> Do you know what the "device not found" error means?
>>
>> It seems attaching virtio-disk1 failed.
>> Can you provide the log when you attach virtio-disk1?
>>
>> Thanks.
>> Wen Congyang
>>
>>>
>>> Thanks.
>>>
>>> Shi
>>>
>>
>>
> 
>