Determining if DAT has I/O error and/or SCSI cable lenght problem?

From: Richard Bemrose <rb237_at_phy.cam.ac.uk>
Date: Wed, 05 May 1999 13:02:18 +0100 (BST)

Hi,

Our main server (AlphaStation 1000 DU 4.0D patch kit #3) recently reported
the following error messages while extracting data from a TLZ07 DAT.
This morning a Compaq engineer replaced the DAT drive unit. Unfortunately,
the error messages reappeared (after the engineer left!). Therefore, I am
suspicious of the data integrity of our Maxell DDS2 DATS? How can I
determine if the DAT has an I/O error?

 Hard Error Detected
 DEC TLZ07 (C)DEC553C
 Active CCB at time of error
 CCB request completed with an error
 Error, exception, or abnormal condition
 MEDIUM ERROR - Nonrecoverable medium error
 cam_logger: CAM_ERROR packet
 cam_logger: bus 0 target 5 lun 0
 ctape_iodone

FYI, the DAT were created on a DAT unit outside of our institution. I
recognise that that DAT unit could be the source of the I/O errors.

In addition, I read an interesting poster with the tru64-unix archive
which may indicate that the I/O error could be related to the length of
the SCSI cable and/or termination problems:
http://www.ornl.gov/its/archives/mailing-lists/alpha-osf-managers/1997/02/msg00167.html

Any advice would be welcome. As always, summary to follow.

Regards,
Rich

 /_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\
/_/ Richard A Bemrose /_\ Polymers and Colloids Group \_\
/_/ email: rb237_at_phy.cam.ac.uk /_\ Cavendish Laboratory \_\
/_/ Tel: +44 (0)1223 337 267 /_\ University of Cambridge \_\
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Received on Wed May 05 1999 - 12:05:02 NZST

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