From: Mogens Valentin <monz@danbbs.dk>
To: Guy <bugzilla@watkins-home.com>
Cc: Linux-scsi <linux-scsi@vger.kernel.org>
Subject: Re: SCSI vs SATA considerations
Date: Sat, 08 May 2004 20:52:06 +0200 [thread overview]
Message-ID: <409D2C56.7B7BEE7E@danbbs.dk> (raw)
In-Reply-To: 200405071455.i47EtBB18653@www.watkins-home.com
Guy wrote:
>
> Check the jumpers on the disk. Most have a force SE jumper, that would
> limit you to 40M/s.
> Also, anything else on the SCSI bus? If so, if 1 device is SE the bus
> must be SE, which would limit you to 40M/s.
No other devices on the scsi bus.
The SE jumper is not installed. Tried with/without - once had an older
IBM scsi disk where the docs had the definition on one pin reverted :-
I had it jumpered as ID2; making it ID0, for some reason it properly
negotiates as a 160 device, at 80MHz, of cause.
I still get only 34.4 MB/s, though (misspelled the speed in first post).
Tried forcing 80MB/s, disabling domain validation, and forcing
termination on the 29160, no change.
Been thinking if IBM at some point sold some DDYS's as pure UW 40MB/s
disks, to satisfy the market...
Out of ideas, except flashing the controller. Latest BIOS should do some
BIOS optimizations and device order stuff, whatever that means.
> -----Original Message-----
> From: linux-scsi-owner@vger.kernel.org
> [mailto:linux-scsi-owner@vger.kernel.org] On Behalf Of Mogens Valentin
> Sent: Friday, May 07, 2004 7:57 AM
> To: Linux-scsi
> Subject: SCSI vs SATA considerations
>
> On a new DDR400, 2200MHz cpu, system, using 29160 with an IBM DDYS disk,
> I get 37MB/s. For reasons I don't understand, the DDYS won't negotiate
> at 80MB/s, will only do 40MB/s.
--
Kind regards,
Mogens Valentin
Networking, Security
www.danbbs.dk/~monz
Phone +45 32 525 878
next parent reply other threads:[~2004-05-08 18:49 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200405071455.i47EtBB18653@www.watkins-home.com>
2004-05-08 18:52 ` Mogens Valentin [this message]
2004-05-09 2:25 ` SCSI vs SATA considerations Douglas Gilbert
[not found] <200405081903.i48J3CB23261@www.watkins-home.com>
2004-05-08 20:22 ` Mogens Valentin
2004-05-07 11:56 Mogens Valentin
2004-05-07 12:13 ` Matthew Wilcox
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