Open Stack

By the way, it's Havana release.

We first found this problem in Ubuntu 12.04 LTS guest, after loading
"acpiphp" kernel module at instance boot time, the problem solved.

Then we tested using CentOS 6.x guest, it seems the code of "acpiphp"
module has been integrated into Linux kernel at compilation time. Nothing
needs to been done, it just works very well. You can freely attach and
detach volumes when instance is running.

But this does not work for Windows guest, you can attach volumes, and you
can detach, but it seems still some information of disk remain in Windows
guest, and you can not attach a second time.

A reboot do cleanup those remained infomation, and we know this. I am
wondering if this attach/detach can be all done when Windows guest is
running, just like it is done in Linux guest.




2014-02-26 15:07 GMT+08:00 Gangur, Hrushikesh (R & D HP Cloud) <
hrushikesh.gangur at hp.com>:

>  I have seen this issue on Linux VMs too. A reboot of the VM instance
> helps workaround this.
>
>
>
> *From:* Zuo Changqian [mailto:dummyhacker85 at gmail.com]
> *Sent:* Tuesday, February 25, 2014 10:34 PM
> *To:* Openstack at lists.openstack.org
> *Subject:* [Openstack] [Nova] KVM Windows Guest disk hot plugging support.
>
>
>
> 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!
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstack.org/pipermail/openstack/attachments/20140226/58619d9b/attachment.html>