[4514] in linux-scsi channel archive
Re: What is this error?
daemon@ATHENA.MIT.EDU (Leonard N. Zubkoff)
Sat Aug 8 07:47:06 1998
Date: Fri, 7 Aug 1998 22:19:54 -0700
From: "Leonard N. Zubkoff" <lnz@dandelion.com>
To: F.Potorti@cnuce.cnr.it
CC: linux-scsi@vger.rutgers.edu
In-reply-to: <m0z4ot4-00083EC@fly.cnuce.cnr.it> (message from Francesco
Potorti` on Fri, 7 Aug 1998 17:57:02 +0200 (CEST))
Date: Fri, 7 Aug 1998 17:57:02 +0200 (CEST)
From: Francesco Potorti` <F.Potorti@cnuce.cnr.it>
Could please someone interpret these misterious numbers for me? I got a
crash tonight while backing up to a scsi tape, and during startup I saw
ugly error messages coming from the scsi driver. Now I see them again.
Kernel is 2.0.34, output of /proc/scsi/scsi and /proc/scsi/BusLogic/0
are appended at the end. Is the disk going to die? Thanks
The status 12 error reported is a Data Over Run. This means that the disk
device tried to provide the host adapter with more data than was requested.
scsi0: CCB #191712 Target 3: Result 70000 Host Adapter Status 12 Target Status 00
scsi0: CDB 08 07 6C 86 00 00
scsi0: Sense 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Synchronous Negotiation: FFUUNUU#FFFFFFFF, Wide Negotiation: Enabled
Target 0: Queue Depth 28, Synchronous at 10.0 MB/sec, offset 15
Target 1: Queue Depth 28, Synchronous at 10.0 MB/sec, offset 15
Target 2: Queue Depth 28, Synchronous at 20.0 MB/sec, offset 15
Target 3: Queue Depth 28, Synchronous at 20.0 MB/sec, offset 15
Target 4: Queue Depth 3, Asynchronous
The above messages show that you have 5 devices connected to the FlashPoint LW,
and you have enabled Ultra SCSI speed for the IBM disks. The specifications
for Ultra SCSI limit the cable length to 1.5 meters if you have more than 4
devices, and also require active termination at both ends of the chain. Most
likely running Ultra SCSI speed on your SCSI bus is outside the tolerances, and
that may be the cause of the problem. I suggest you limit the SCSI bus to Fast
SCSI-2 (10 MHz) speed and see if you still have problems. It's possible there
is a hardware problem with your FlashPoint or with the IBM drive, but checking
the cabling and termination is always the first thing to do when diagnosing
SCSI problems.
Leonard
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