Here is the command<div><div>[root@test2 images]# virsh attach-disk 1 /var/lib/libvirt/images/disk.qcow2  vdb  --driver file --subdriver qcow2</div><div>Disk attached successfully</div><div><br></div><div>Here is the log I found relevant (too much under debug mode)<br>
<div>15:31:52.902: debug : virEventInterruptLocked:668 : Interrupting</div><div>15:31:52.902: debug : qemuMonitorCommandWithHandler:235 : Receive command reply ret=0 errno=0 30 bytes &#39;unknown command: &#39;drive_add&#39;^M</div>
<div>&#39;</div><div>15:31:52.902: debug : virEventRunOnce:595 : Poll got 1 event</div><div>15:31:52.902: debug : virEventDispatchTimeouts:405 : Dispatch 3</div><div>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</div>
<div>15:31:52.902: debug : virEventDispatchHandles:450 : Dispatch 8</div><div>15:31:52.902: debug : qemuMonitorCommandWithHandler:230 : Send command &#39;device_add virtio-blk-pci,bus=pci.0,addr=0x6,drive=drive-virtio-disk1,id=virtio-disk1&#39; for write with FD -1</div>
</div><div><br></div><div>Than you very much.</div><div><br></div><div>Shi</div><div><br></div><div><br></div><div><br></div><div><br></div><br><div class="gmail_quote">On Thu, Mar 3, 2011 at 10:12 PM, Wen Congyang <span dir="ltr">&lt;<a href="mailto:wency@cn.fujitsu.com">wency@cn.fujitsu.com</a>&gt;</span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div><div></div><div class="h5">At 03/04/2011 01:00 PM, Shi Jin Write:<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt;     &lt;disk type=&#39;file&#39; device=&#39;disk&#39;&gt;<br>
&gt;&gt;       &lt;driver name=&#39;qemu&#39; type=&#39;qcow2&#39; cache=&#39;none&#39;/&gt;<br>
&gt;&gt;      &lt;source file=&#39;/var/lib/libvirt/images/rhel6rc_64.img&#39;/&gt;<br>
&gt;&gt;      &lt;target dev=&#39;hda&#39; bus=&#39;ide&#39;/&gt;<br>
&gt;&gt;      &lt;alias name=&#39;ide0-0-0&#39;/&gt;<br>
&gt;&gt;      &lt;address type=&#39;drive&#39; controller=&#39;0&#39; bus=&#39;0&#39; unit=&#39;0&#39;/&gt;<br>
&gt;&gt;    &lt;/disk&gt;<br>
&gt;&gt;    &lt;disk type=&#39;file&#39; device=&#39;cdrom&#39;&gt;<br>
&gt;&gt;      &lt;driver name=&#39;qemu&#39; type=&#39;raw&#39;/&gt;<br>
&gt;&gt;      &lt;source file=&#39;/var/lib/libvirt/images/test.iso&#39;/&gt;<br>
&gt;&gt;      &lt;target dev=&#39;hdc&#39; bus=&#39;ide&#39;/&gt;<br>
&gt;&gt;      &lt;readonly/&gt;<br>
&gt;&gt;      &lt;alias name=&#39;ide0-1-0&#39;/&gt;<br>
&gt;&gt;      &lt;address type=&#39;drive&#39; controller=&#39;0&#39; bus=&#39;1&#39; unit=&#39;0&#39;/&gt;<br>
&gt;&gt;    &lt;/disk&gt;<br>
&gt;&gt;     &lt;disk type=&#39;file&#39; device=&#39;disk&#39;&gt;<br>
&gt;&gt;      &lt;driver name=&#39;file&#39; type=&#39;qcow2&#39;/&gt;<br>
&gt;&gt;       &lt;source file=&#39;/var/lib/libvirt/images/test3.img&#39;/&gt;<br>
&gt;&gt;       &lt;target dev=&#39;vdb&#39; bus=&#39;virtio&#39;/&gt;<br>
&gt;&gt;       &lt;alias name=&#39;virtio-disk1&#39;/&gt;<br>
&gt;&gt;      &lt;address type=&#39;pci&#39; domain=&#39;0x0000&#39; bus=&#39;0x00&#39; slot=&#39;0x06&#39;<br>
&gt;&gt; function=&#39;0x0&#39;/&gt;<br>
&gt;&gt;    &lt;/disk&gt;<br>
&gt;&gt;    &lt;controller type=&#39;ide&#39; index=&#39;0&#39;&gt;<br>
&gt;&gt;      &lt;alias name=&#39;ide0&#39;/&gt;<br>
&gt;&gt;      &lt;address type=&#39;pci&#39; domain=&#39;0x0000&#39; bus=&#39;0x00&#39; slot=&#39;0x01&#39;<br>
&gt;&gt; function=&#39;0x1&#39;/&gt;<br>
&gt;&gt;    &lt;/controller&gt;<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt; Thank you very much. It is exactly the same output as mine, particularly<br>
&gt;  &lt;driver name=&#39;file&#39; type=&#39;qcow2&#39;/&gt;<br>
&gt; I thought it has to be name=&#39;qemu&#39; to detach properly but since you didn&#39;t<br>
&gt; have a problem, I am very lost on why mine didn&#39;t work.<br>
&gt;<br>
&gt; My libvirtd.log shows (with debugging turned on)<br>
&gt; 14:43:18.965: debug : qemuMonitorCommandWithHandler:235 : Receive command<br>
&gt; reply ret=0 errno=0 33 bytes &#39;Device &#39;virtio-disk1&#39; not found^M<br>
&gt; &#39;<br>
&gt; 14:43:18.965: debug : virEventDispatchTimeouts:405 : Dispatch 3<br>
&gt; 14:43:18.965: debug : virEventDispatchHandles:450 : Dispatch 8<br>
&gt; 14:43:18.965: error : qemuMonitorTextDelDevice:2314 : operation failed:<br>
&gt; detaching virtio-disk1 device failed: Device &#39;virtio-disk1&#39; not found^M<br>
&gt;<br>
&gt; Do you know what the &quot;device not found&quot; error means?<br>
<br>
</div></div>It seems attaching virtio-disk1 failed.<br>
Can you provide the log when you attach virtio-disk1?<br>
<br>
Thanks.<br>
Wen Congyang<br>
<br>
&gt;<br>
&gt; Thanks.<br>
&gt;<br>
&gt; Shi<br>
&gt;<br>
<br>
</blockquote></div><br><br clear="all"><br>-- <br>Shi Jin, Ph.D.<br><br>
</div>