RE: [Xen-devel] [RFC] [0/4] PV driver for FC transport layer

[FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx>]

From: "Ian Pratt" <Ian.Pratt@xxxxxxxxxxxx>
Subject: RE: [Xen-devel] [RFC] [0/4] PV driver for FC transport layer
Date: Tue, 3 Jul 2007 01:07:04 +0100

> > We developed a prototype of para-virtual FC(Fibre Channel) SCSI
> driver.
> > It's a extension of the "pv-scsi" driver, that Horikoshi-san posted on
> > 16 May 2007 ([Xen-devel] [RFC] pv-scsi driver (scsiback/scsifront)),
> > in order to support FC transport layer.
> 
> I'm struggling slightly to understand the usage scenario planned for
> this stuff. Mapping a SCSI LUN through to a guest makes perfect sense
> (e.g. for performing SCSI reservations, special SCSI commands like FUA,
> controlling a tape robot etc), but mapping a whole HBA through to a
> guest seems less useful -- usually it's the case you want to hide all
> that nastiness from the guest, taking care of multipath etc in dom0
> rather than exposing it to the guest. 

Mapping a SCSI LUN through to a guest is far complicated since it
needs the SCSI state machine.

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