[Veritas-bu] FW: media write errors

I have seen problems with media so bad as to cause SCSI Parity errors, You
may want to keep track of the media and it's travels, if a piece of media is
mounted on drive three on night 1 and then on night 2 the same media gets
mounted to drive 2 and get's a 84 error, is then remounted on drive one and
runs fine, then the next night it mounts on drive 3 and is fine then on
drive 4 and gets an error 84 it may be that the firmware on your drives is
different, or that one drive has misaligned heads and the another is closely
misaligned so it can use the tape, but the other 2 are aligned just fine so
they reject the tape.

Follow the path of the tapes for a couple of nights and you may get a better
answer.

As for Josh and his Lego tapes, check in the NetBackup Configuration GUI and
check all the MEDIA Overwrite boxes restart the daemons and give it a shot,
it should relable, but I'm not positive.

Bob

-----Original Message-----
From: John_Wang AT enron DOT net [mailto:John_Wang AT enron DOT net]
Sent: Thursday, January 11, 2001 9:33 AM
To: KevinB AT paccessglobal DOT com
Cc: veritas-bu AT mailman.eng.auburn DOT edu
Subject: RE: [Veritas-bu] FW: media write errors - 84




Hello Kevin

Actually, I've been getting a spate of status 85's recently with AIT2
drives.

Each time it occurs, it seems to be one tape causing the problem on multiple
drives till it freezes out.   Comparing with my notes, each of the tapes
that
has caused these problems had been degaussed three times as the tapes that
expire from our mail pool get degaussed and relabelled before returning to
the
scratch pool.

I suspect that degaussing is not a good thing with AIT2, unfortunately the
default behaviour to the erase command for AIT2 is to only erase the first
300
bytes, the AIT manual says that if the least significant bit of the second
byte
of the SCSI command descriptor block for the erase command is a one, it will
erase the entire tape but I have no idea how to issue an erase command with
that
bit flipped on Solaris and so far no answer from the Comp.sys.sun.admin
newsgroup either.   We have a policy of rendering the tapes unreadable for
mail
folder backups after the seventh day, no if's ands or buts allowed, the
client
wishes to limit their liability in legal matters.

Regards,
John I Wang
Sr. Systems Engineer
Steverson Information Professionals

---
Enron Broadband Services
3 Allen Center 3AC872e
ph (713) 345-6863




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  |       Subject:     RE: [Veritas-bu] FW: media write errors - 84       |
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Next question: is any one on the list having frequent error 84 on drives
other than DLT 7000 (DLT 8000, Sony AIT, AIT2, etc.)?

...





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