OK, that post puts me in the minority, and I haven’t searched or tested
to verify this, but I thought the only problem with SCSI emulation in Xen on
HVMs was that the QEMU BIOS wouldn’t boot to a SCSI drive. My understanding is
that the drives will be emulated, but you would need drivers for them in order
to use them. I would also go as far as to swear up and down that I have seen
SCSI drivers for Xen HVMs more than once (once they weren’t for HDs, but I
think they were the other time). Regardless, emulating SCSI shouldn't provide
any performance increase once using PV drivers anyway.
Dustin
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Nick Couchman
Sent: Monday, January 19, 2009 10:02
To: pasik@xxxxxx
Cc: christoffer@xxxxxxxxx; xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Limited number of phy disks?
As far as I know, the current Qemu implementation in Xen for HVM support does
not support SCSI. As James pointed out, though, if you use the GPL PV drivers,
you can assign as many devices as you want to the HVM domU. The catch to that
is that if you ever have to boot with /nogplpv (to disable the GPL PV drivers),
you'll lose everything except disk devices hda-hdd.
-Nick
-----Original Message-----
From: Pasi Kärkkäinen <pasik@xxxxxx>
To: Nick Couchman <Nick.Couchman@xxxxxxxxx>
Cc: christoffer@xxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Limited number of phy disks?
Date: Mon, 19 Jan 2009 16:03:43 +0200
On Sun, Jan 18, 2009 at 02:45:06PM -0700, Nick Couchman wrote:
> I assume you're running as an HVM? What version of Xen are you using?
> As far as I know, Xen only support IDE drives in HVM domUs,
> and it only supports a total of four drives - hda, hdb, hdc, and hdd.
>
Hi.
Afaik Qemu supports SCSI disk/adapter emulation nowadays too..
SCSI disk support is not yet implemented in Xen (version of Qemu)?
-- Pasi
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