Re: Exabyte 8500 problems? (SUMMARY)

From: Roger Moises (
Date: Wed Jun 16 1993 - 12:08:15 CDT

  My original posting:

>Configuration: Sun SPARCstation 10/30
> 32 Mb memory, 150 Mb swap
> Exabyte EXB-8500 8mm Helical Scan (/dev/rst0)
> SunOS 4.1.3
> Using cron, I run nightly backups (combination of full and incremental
>dumps) of the HP C3010-002 SCSI disks on this machine onto the locally attached
>8mm tape drive. Two of the scripts that dump between 4-5 Gb of data fail at a
>point ~2 Gb into the script with the error:
> DUMP: Tape write error 0 feet into tape 1
> DUMP: fopen on /dev/tty fails
> DUMP: The ENTIRE dump is aborted.
> This happens with new (out-of the-box) tapes and previously used (dumps written
>on our old EXB-8200 tape drive). Is there some initialization process (hardware or
>software) that needs to be done, allowing me to write up to 5Gb onto these tapes?
>The following command is used within the backup script:
> /etc/dump 0unbsdf 126 13000 54000 /dev/nrst0 <filesystem>
> Any help/advice that you can provide is appreciated!

  My thanks go out to the following people who pointed out I was incorrectly
specifying the low-density tape device (/dev/nrst0) and not the high-density
tape device (/dev/nrst8):

Doug Greenwald ( - suggested tape head cleaning
Mathew Atkins (
Leonard Mills (

Roger T. Moises - UNIX System Manager
Lockheed Missiles & Space Co., Inc. Palo Alto, CA

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