From owner-freebsd-scsi  Sun Mar 11 20:25:44 2001
Delivered-To: freebsd-scsi@freebsd.org
Received: from feral.com (feral.com [192.67.166.1])
	by hub.freebsd.org (Postfix) with ESMTP id DC7EC37B719
	for <freebsd-scsi@FreeBSD.ORG>; Sun, 11 Mar 2001 20:25:41 -0800 (PST)
	(envelope-from mjacob@feral.com)
Received: from beppo (beppo [192.67.166.79])
	by feral.com (8.9.3/8.9.3) with ESMTP id UAA32765;
	Sun, 11 Mar 2001 20:25:27 -0800
Date: Sun, 11 Mar 2001 20:25:24 -0800 (PST)
From: Matthew Jacob <mjacob@feral.com>
Reply-To: mjacob@feral.com
To: Olivier Nicole <on@cs.ait.ac.th>
Cc: freebsd-scsi@FreeBSD.ORG
Subject: Re: SCSI speed with SLR100 tape drive
In-Reply-To: <200103120325.KAA09448@banyan.cs.ait.ac.th>
Message-ID: <Pine.BSF.4.21.0103112024370.52110-100000@beppo.feral.com>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Sender: owner-freebsd-scsi@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.org



On Mon, 12 Mar 2001, Olivier Nicole wrote:

> 
> Hello,
> 
> I finally got that SLR100 tape drive I wanted. It si supposed to
> support SCSI 160, but anyway the machine I have only supports 80Mb.
> 
> The problem is the following:
> 
> - at boot time, going to the Symbios bios, the tape is given at
>   maximum speed, 80 Mb
> 
> - once FreeBSD is started, it only supports half the speed:
>   sa0 at sym1 bus 0 target 2 lun 0
>   sa0: <TANDBERG SLR100 0402> Removable Sequential Access SCSI-2 device 
>   sa0: 40.000MB/s transfers (20.000MHz, offset 15, 16bit)
> 
> Any idea on the reason why?

It's not 'half the speed'. Please go read some SCSI FAQs somewhere.

> 
> Eventually, I had to modify /usr/src/sys/cam/scsi/scsi_sa.c to remove
> the leading blank from the model name in the quirk table.


> 
> Best regards,
> 
> Olivier
> 
> To Unsubscribe: send mail to majordomo@FreeBSD.org
> with "unsubscribe freebsd-scsi" in the body of the message
> 


To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-scsi" in the body of the message