From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([208.118.235.92]:34956)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <kraxel@redhat.com>) id 1S5Y1H-0003cj-Ra
	for qemu-devel@nongnu.org; Thu, 08 Mar 2012 02:44:21 -0500
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <kraxel@redhat.com>) id 1S5Y1D-00036f-8c
	for qemu-devel@nongnu.org; Thu, 08 Mar 2012 02:44:15 -0500
Received: from mx1.redhat.com ([209.132.183.28]:43402)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <kraxel@redhat.com>) id 1S5Y1D-00036S-13
	for qemu-devel@nongnu.org; Thu, 08 Mar 2012 02:44:11 -0500
Message-ID: <4F586345.8010905@redhat.com>
Date: Thu, 08 Mar 2012 08:44:05 +0100
From: Gerd Hoffmann <kraxel@redhat.com>
MIME-Version: 1.0
References: <alpine.LFD.2.02.1203042102180.30701@bbs.intern>
	<alpine.LFD.2.02.1203070741190.21075@bbs.intern>
	<op.was171alv638fp@l311563.la.gr.repsolypf.com>
	<alpine.LFD.2.02.1203072041440.30263@bbs.intern>
In-Reply-To: <alpine.LFD.2.02.1203072041440.30263@bbs.intern>
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Subject: Re: [Qemu-devel] XP install cores with SCSI LSI 53C895A disks
List-Id: <qemu-devel.nongnu.org>
List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.nongnu.org/archive/html/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: Gerhard Wiesinger <lists@wiesinger.com>
Cc: Brian Jackson <iggy@theiggy.com>, qemu-devel@nongnu.org

On 03/07/12 20:58, Gerhard Wiesinger wrote:
> On Wed, 7 Mar 2012, Brian Jackson wrote:
>> I think most people trying to use qemu for anything useful have given
>> up on if=scsi. Some distros even disable support because they don't
>> want to QA it. That should be a decent sign that you may want to avoid
>> it.
> 
> OK, but SAS (Serial attached SCSI) is technology in the area of storage
> interface technology where all big storage vendors see future (e.g. they
> give up: FC and SATA drives, SATA drives are replaced by MDL SATA drives
> (SATA 7200RPM drives with SAS interface)).

The problem isn't scsi.  The problem is the lsi adapter.  Problem #1 is
the hardware design which makes it hard to emulate it correctly and #2
that you need a non-redistributable rom file to boot from it.

> Therefore I don't understand why distros are giving up SAS which is also
> SCSI (of course old legacy SCSI is understandable).

Nobody gives up on scsi.  See virtio-scsi merged recently.  There also
is megasas aiming for merge (which shares the boot issue with lsi though).

cheers,
  Gerd