[5435] in linux-scsi channel archive
AIC7xxx parity mystery
daemon@ATHENA.MIT.EDU (Roy C Bixler)
Wed Dec 16 14:40:32 1998
Date: Wed, 16 Dec 1998 12:04:54 -0600 (CST)
From: Roy C Bixler <rcb@press-gopher.uchicago.edu>
To: linux-scsi@vger.rutgers.edu
cc: dledford@redhat.com
Hello:
I've written here before about some AIC7xxx driver problems encountered on
a Dell Poweredge 2200 system running Linux 2.1.127pre1 (which is basically
2.1.126 with minor patches.) The symptoms were that, once every one or two
weeks, some messages like the following:
Dec 2 00:49:06 press kernel: (scsi0:0:0:0) Parity error during Data-In phase.
Dec 8 09:08:40 press kernel: (scsi0:0:0:0) Parity error during Message-In phase.
Dec 8 09:08:55 press kernel: scsi : aborting command due to timeout : pid 16061190, scsi0, channel 0, id 0, lun 0 Read (6) 1e f5 6d 02 00
Dec 8 09:08:55 press kernel: scsi : aborting command due to timeout : pid 16061191, scsi0, channel 0, id 1, lun 0 Read (6) 06 00 0e 02 00
Dec 8 09:08:56 press kernel: SCSI host 0 abort (pid 16061190) timed out - resetting
Dec 8 09:08:56 press kernel: SCSI bus is being reset for host 0 channel 0.
Dec 8 09:08:56 press kernel: (scsi0:0:1:0) Synchronous at 40.0 Mbyte/sec, offset 8.
Dec 8 09:08:57 press kernel: (scsi0:0:0:0) Synchronous at 40.0 Mbyte/sec, offset 8.
Dec 8 09:40:45 press kernel: (scsi0:0:0:0) Parity error during Data-In phase.
Dec 8 09:42:15 press kernel: (scsi0:0:0:0) Parity error during Data-In phase.
Dec 8 09:50:09 press kernel: (scsi0:0:0:0) Parity error during Data-In phase.
Dec 10 04:41:55 press kernel: (scsi0:0:0:0) Parity error during Data-In phase.
*** crash here ***
Dec 10 10:57:34 press kernel: (scsi0:0:0:0) Parity error during Message-In phase.
Dec 10 10:57:34 press kernel: (scsi0:0:0:-1) Unexpected busfree, LASTPHASE = 0xa0, SEQADDR = 0x155
Dec 10 10:57:38 press kernel: (scsi0:0:0:0) Parity error during Message-In phase.
Dec 10 10:57:38 press kernel: (scsi0:0:0:-1) Unexpected busfree, LASTPHASE = 0xa0, SEQADDR = 0x155
Dec 10 11:08:34 press kernel: (scsi0:0:0:0) Parity error during Data-In phase.
Dec 10 11:08:34 press kernel: (scsi0:0:0:0) Parity error during Data-In phase.
Dec 10 11:08:34 press kernel: (scsi0:0:0:0) Synchronous at 40.0 Mbyte/sec, offset 8.
Dec 11 09:01:05 press kernel: (scsi0:0:0:0) Parity error during Data-In phase.
appear in the kern.log file. I have annotated once where the system
actually locked up hard. I haven't gotten any answer to my previous
query, so I gather it's not a common problem.
On the first chance I got after the crash, I took down the machine and
checked the SCSI BIOS. One thing I noticed is that our SCSI controllers
were configured for 'parity enabled' and the AIC7xxx driver defaults to
'parity disabled'. I checked the source code and found a comment to the
effect that PCI parity checking is 'dubious at best.' My question is:
why? I did disable parity checking in the SCSI BIOS in hopes that will
solve the random error messages and make the machine stable again. I
would appreciate any insights anyone might have about this problem.
Thanks!
---
Roy Bixler
The University of Chicago Press
rcb@press-gopher.uchicago.edu
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