[4157] in linux-scsi channel archive
Re: Timeout errors with ncr53c895
daemon@ATHENA.MIT.EDU (Richard Waltham)
Thu Jun 18 03:25:36 1998
From: Richard Waltham <dormouse@farsrobt.demon.co.uk>
To: ofcantero@ceife.es (Oscar Fernandez Cantero)
Date: Thu, 18 Jun 1998 08:17:35 +0100 (BST)
Cc: linux-scsi@vger.rutgers.edu
In-Reply-To: <3587AA9C.C72CD573@ceife.es> from "Oscar Fernandez Cantero" at Jun 17, 98 11:38:04 am
Oscar Fernandez Cantero wrote:
>
> Hello SCSIers of the world,
>
> I have recently got a Symbios SYM8951U Ultra2 card with NCR53C895 SCSI
> chip.
> I use it with 3 Cheetah Ultra2 drives in a raid0 configuration.
> I use kernel 2.0.34 patched with driver NCR53C8XX version 3.0 (the last
> I think).
>
> When I use them in 20MHz mode (40Mb/s selectable in the setup utility o=
> f
> the card)
> all works fine. But when I try changing to 40MHz mode (Ultra2 mode) the
> configuration
> continues to be usable, but at arbitrary times an error arises that
> suspends
> the SCSI bus for a moment.
>
> The error says:
>
>
> scsi : aborting command due to timeout : pid 186838, scsi2, channel 0,
> id 2, lun 0 Read (6) 00 a5 48 30 00
> ncr53c8xx_abort: pid=3D186838 serial_number=3D186870
> serial_number_at_timeout=3D186870ncr53c895-0: abort ccb=3D013dd020 (can=
> cel)
>
Just seen my original reply to appear via the list and my text seems to have
disappeared so I'll try again.
Hi Oscar,
I was running ncr53c8xx v2.6n without problems. Upgrading to 3.0/3.0a and
I've been having bursts of timeouts and a very slight data corruption but
nothing fatal. (3.0 is the last general release - 3.0a is experimental)
Timeouts generally occured while booting and while shutting down and only
once at another time - while news was expiring last night.
I'm using a SYM8951U but with Seagate Baraccuda ST15150N - single ended
10MB/s. This combination found a bug in the 895 code which was quickly fixed
- to do with initialisation back at the end of April - and since then has
behaved perfectly. I'm using the single ended drive as I can't afford to buy
an LVD drive just yet:(
This combination has been in use with the 2.6 driver for a couple of months
with no problems and with an 875 and 810a cards before that for at least a
couple of years - I've lost track of exactly how long;)
I have since reverted back to using 2.6n and the timeouts have gone.
Bye for now
Richard
--
Richard Waltham | Work: richard@digitalinterface.demon.co.uk
At home in | Home: dormouse@farsrobt.demon.co.uk
Southampton UK | 100421.1276@compuserve.com
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