[2798] in linux-scsi channel archive
Re: NCR53x810 SCSI error
daemon@ATHENA.MIT.EDU (Office9x+eXchange=emperors new clo)
Wed Nov 12 13:09:00 1997
Date: Wed, 12 Nov 1997 10:21:06 -0700
From: fiala@cxcad.cxo.dec.com (Office9x+eXchange=emperors new clothes)
To: LINUX-SCSI@vger.rutgers.edu
X-Vms-To: LINUX-SCSI@VGER.RUTGERS.EDU
>>>I have come across a very similar looking issue, again with
>>>the 810 port. I beleive that there are some devices that
>>>for some reason seem to take a while responding to
>>>request-sense [and possibly other commands].
>>>I am of the opinion that the timeout values used by
>>>the Linux SCSI layer may be overly aggresive.
>>>
>>>Further, by observation it looks like a Bus Reset
>>>[Avanti+810] is never recovered from. Instant hang.
>>>[Maybe job #2?]
>>>
>>>I'm looking for advice on trying extended timers.
>>>Looks like rebuilding the relevant module [name escapes me,
>>>{scsi_cam.c ??}] with DEBUG defined would give me extended
>>>timeouts and more debug info...
>>>It didnt look like the timers were exported as globals
>>>that could be modified from the boot/load command line...
>>>[job #3?]
>>>
>>>I first encounterd this on an Alpha [Avanti] but will
>>>probably reproduce it using an X86 so I can use the
>>>loadable-module mechanism to make the debug less intrusive.
>>>
>>>Anyone got any advice??. I keep putting off doing it
>>>as it would be my first foray into Linux internals.
>>>Birth by fire???.
>>>
>>>I have the howto's... tucked away for when I feel brave.
>>>
>>> Stefan Fiala
>>>--------------------------------------------------------------------------------
From: SMTP%"xmm@ugai.kcn.ru" 11-NOV-1997 17:33:44.05
To: Linux SCSI List <linux-scsi@vger.rutgers.edu>
CC:
Subj: NCR53x810 SCSI error
Hi!
Two day I had been geting scsi error, that hang server.
Oct 27 10:23:10 office kernel: scsi0 : channel 0 target 4 lun 0 request sense failed, performing reset.
Oct 27 10:23:10 office kernel: SCSI bus is being reset for host 0 channel 0.
Oct 27 10:23:10 office kernel: scsi0 : DCMD|DBC= ...
... See below ...
--------- Rest omitted for brevity -------------------
