Re: [Xen-devel] RE: [Xen-users] Release 0.9.2 of GPL PV Drivers for Windows

["Emre ERENOGLU" <erenoglu@xxxxxxxxx>]

Well, not :)

I think this will be most useful when we have a drive to assign to a guest, and also especially good for CD Burners. In the current implementation, I think we can't export such devices to domains. :)

Emre

On Thu, May 29, 2008 at 1:02 PM, James Harper <james.harper@xxxxxxxxxxxxxxxx> wrote:

> Hi Jun,
>
> Could you please tell us if it will be possible to "export" a LVM
Volume
> as a SCSI drive? Or maybe I shall ask, would it make sense? If not, is
> your pvSCSI implementation only efficient when there's an actual
physical
> scsi device on the dom?
>

It wouldn't make sense. I can't think of any advantage to turning a
block device into a scsi device for that purpose. The windows xenvbd
driver does this on the windows side, but only because it appears to be
the best way to present a disk device to Windows.

The pvSCSI is a passthrough mechanism for 'sg' devices (eg /dev/sgX) and
allows the passing through of raw scsi commands. Great for CD burners,
tape drives, scanners (do SCSI scanners still exist???) and other
non-block-device devices, but not necessary for lvm backed or file
backed block devices.

Did you have a particular reason in mind? Maybe you thought of something
I didn't :)

James

-- 
Emre
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