RE: [Xen-devel] XCP PV driver

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

I guess that succeeding the ops may affect the slew of WHQL tests that the 
storage driver is expected to pass.
It'd be kind of nice to make it work 'properly' such that a disk image passed 
into multiple VMS could be shared via MSCS, and we could still pass WHQL. I'll 
stick it on the bottom of my 'have a look at this' list.

  Paul

> -----Original Message-----
> From: Soubir Acharya [mailto:acharya@xxxxxxxxxxx]
> Sent: 01 February 2011 14:42
> To: James Harper
> Cc: Paul Durrant; xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-devel] XCP PV driver
> 
> On 2/1/2011 8:27 AM, James Harper wrote:
> >> No, we don't support I_T nexus registration; the model is a
> simple
> > non-shared
> >> SCSI bus.
> >>
> > GPLPV tells windows that these SCSIOP's are supported (just
> returns
> > STATUS_SUCCESS), but they don't actually do anything. As Paul
> implies
> > there is no mechanism to pass such a message back to the actual
> device
> > (which could just be a file on disk anyway). It doesn't block
> anything
> > else from accessing the device.
> >
> > Maybe you could use iSCSI in the DomU instead?
>  >> True, but not as simple as using files out of dom0 as storage.
> > James
> >
> Thanks. There is no reason the XCP driver could not do the same,
> right?
> Shared disks would still be "unsupported" but it would just work on
> a
> single physical node.
> I think the configuration is useful to train/demo/play around with
> Windows configurations requiring shared disks.
> Oracle RAC, Fail-over clustering to name a few.
> Even a single node cluster is a valid configuration for learning.
> 
> Soubir
> 


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