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

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. :)


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
> 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
> 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 :)


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