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Hi

Currently we use Cpeh RBD as cinder volume. According to
http://www.linux-kvm.org/page/Hotadd_pci_devices, we have Linux KVM guest
(both CentOS 6.x and Ubuntu 12.04) support disk hot plugging, it works well.

But there is problem with Windows 2008 guest (2003 not tested). Described
below:

1) Launch an Windows 2008 instance (with RedHat Virtio Driver installed),
and attach a volume (newly created with nothing inside) to it, the volume
would be successfully attached to /dev/vdb.

2) In Windows (guest machine), format this newly added disk. After
formatting, it will show up in "My Computer" windows. Create any file
(readme.txt with some text in it for example) inside the new disk. Then
deatch the volume.

After about one or two minute, a message box would show up in Windows,
saying that the device not properly removed, and the newly added disk would
still show in "My Computer" window. But with "cinder list" command, we can
see that the volume was successfully detached.

3) Now reattach to volume to instance, it would failed.

Libvirt log shows:

error : qemuMonitorJSONCheckError:357 : internal error unable to execute
QEMU command '__com.redhat_drive_add': Duplicate ID 'drive-virtio-disk1'
for drive


I googled yesterday afternoon, didn't find useful information. Would any
one tell me whether Windows 2003/2008 as kvm fully virtualized guest
supports disk hot plugging and removing or not? Or any possibility I have
got something wrong?

Thanks for help!
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