SCSI tape problems

From: Antti Autio <aa_at_oukasrv2.ouka.fi>
Date: Thu, 6 Jul 1995 10:04:03 +0300 (EET DST)

Hello OSFers and thanks to you great bucnch of ppl :) It's been nice reading
problems being solved in practically no time etc... anyway, it think it's
my time to turn for help now :-o

Hardware: DECpc axp 150 with OSF/1 3.0, DEC Storageworks expansion box,
TLZ06 external DAT tape drive.

Problem: backup operations fail with tar tape write / I/O error and the
error message below on console log. Symptoms include also
serious slowing down/hanging of the computer before the error messages.
Small operations (writing/extracting below ~20 Mb or so) work fine.

Apparently the problem has something to do with the SCSI bus. Boot-time
self-tests say SCSI is OK. List of SCSI devices:

internal: 2 x RZ28 disks, 1 x 1 Gb disk (can't remember the type but it's a
DEC disk), RRZ42 CD-ROM (SCSI IDs 1,2,0,4)

external: DEC Storageworks 3-slot expansion box with an RZ28 (SCSI id 3),
          connected to the main box
          TLZ06 tape drive (SCSI id 5), connected via the expansion box

I had the same problem with a TZ85 tape. The problem propably concerns
also the expansion box: tape backups were noticed to fail a couple of
days after the expansion box was added to the system.

Any help appreciated.

And now for the error message:

cam_logger: CAM_ERROR packet
cam_logger: bus 0
aha_bus_reset
Resetting the SCSI bus at request
cam_logger: CAM_ERROR packet
cam_logger: bus 0
aha_bus_reset
Resetting the SCSI bus at request
cam_logger: CAM_ERROR packet
cam_logger: bus 0
aha_process_intr
SCSI bus reset occurred

cam_logger: CAM_ERROR packet
cam_logger: bus 0
aha_process_intr
SCSI bus reset occurred

cam_logger: CAM_ERROR packet
cam_logger: bus 0 target 5 lun 0
ctape_async
Bus reset notification
Hard Error Detected
DEC TLZ06

--
Antti Autio						+358-81-3141156
Oulu, Finland/Computer Center				aautio_at_ouka.fi
Received on Thu Jul 06 1995 - 09:34:14 NZST

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