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

To:	"James Harper" <james.harper@xxxxxxxxxxxxxxxx>
Subject:	Re: [Xen-devel] RE: [Xen-users] Release 0.9.2 of GPL PV Drivers for Windows
From:	"Emre ERENOGLU" <erenoglu@xxxxxxxxx>
Date:	Thu, 29 May 2008 13:10:38 +0200
Cc:	Jun Kamada <kama@xxxxxxxxxxxxxx>, Stephan Seitz <s.seitz@xxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx
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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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Re: [Xen-devel] RE: [Xen-users] Release 0.9.2 of GPL PV Drivers for Wind