[Xen-devel] Can't hotplug SCSI disk in Xen4.0

[<wenche_chang@xxxxxxxxxxxx>]

I use virsh attach-disk to attach a volume to a running VM

After execution, I use “virsh dumpxml“ to see the config and it shows

<disk type='file' device='disk'>

 <driver name='file'/>

  <source file='/tmp/testvolume'/>

  <target dev='sdc' bus='scsi'/>

</disk>

 

The problem is, I can’t find the scsi disk, if I don’t reboot this VM

 

Detach also causes some problems

I tried the following commands when VM is running

[root@localhost ~]# virsh detach-disk centos sdc
error: Failed to detach disk
error: POST operation failed: xend_post: error from xen daemon: (xend.err 'Device 2080 (vbd) could not be disconnected. ')

 

[root@localhost ~]# xm block-detach centos sdc
Error: Device sdc (vbd) could not be disconnected.

 

When VM is off

[root@localhost ~]# virsh detach-disk centos sdc
error: Failed to detach disk
error: Unknown failure

 

xm block-detach centos sdc can success.

 

any idea about this problem?

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