Re: [Qemu-devel] Virtio Disk drivers and Microsoft clustering

[Stefan Hajnoczi <stefanha@redhat.com>]

[-- Attachment #1: Type: text/plain, Size: 2045 bytes --]

On Mon, Feb 09, 2015 at 09:18:15AM +0800, Fam Zheng wrote:
> On Fri, 02/06 11:23, Fam Zheng wrote:
> > On Thu, 02/05 15:29, massimo buscato wrote:
> > > Hi all!
> > > 
> > > About virtio-scsi driver:
> > > There are many problem to use it on windows 2012 cluster service.
> > > 
> > > Every time you try to validate a Virtio disk under W2012 cluster tool,
> > > you have this errors:
> > > 
> > > with VIRTIO DISK device:
> > > "The port driver used by the disk does not support clustering. Disk
> > > bus type does not support clustering. Disk partition style is MBR.
> > > Disk type is BASIC."
> > > 
> > > with VIRTIO SCSI DISK device:
> > > "The port driver used by the disk does not support clustering. Disk
> > > bus type does not support clustering. Disk partition style is MBR.
> > > Disk type is BASIC. The required inquiry data (SCSI page 83h VPD
> > > descriptor) was reported as not being supported. "
> > 
> > Hi Massimo,
> > 
> > I don't know much about Windows cluster service but I think this error is
> > because virtio-scsi is a direct attached controller, like explained in:
> > 
> > http://support.microsoft.com/kb/2839292?wa=wsignin1.0
> > 
> 
> Discussed a bit with Massimo off-list, this feature basically means two systems
> can see the same lun at the same time, and one of them accesses it. When one
> system is down, the other takes over. In VMware a disk with RDM (raw device
> mapping) could be added, so I think scsi-block and/or scsi-generic should work
> too.
> 
> If I understand correctly, Massimo uses image based scsi-disk.
> scsi-{block,generic} requires a scsi target on host side. In order to use an
> image file, we could use iscsi service to export the host image and use the
> iscsi driver in QEMU. Not sure if there are simpler ways.

Sounds like emulating SCSI clustering features (like reservations) on
top of a host file system - but this needs to work across multiple
hosts.

Massimo: Can you describe the shared storage setup you are using?

Stefan

[-- Attachment #2: Type: application/pgp-signature, Size: 473 bytes --]