mysterious Netbackup/drive issues

From: danix (danix@cloud9.net)
Date: Mon May 20 2002 - 10:06:49 EDT


Grr. I posted in detail about this problem but something in the headers caused
the post to be help for moderation, and it never got posted.
Let's hope this gets through.

We have a running backup system using Netbackup 3.4.1 on an E450, with a small SStoragetek jukebox. About a month ago we added a larger jukebox to the system,
and it was going so well, our backup admin set all jobs to go to the large
device and removed the smaller one from netbackup, though leaving it plugged
and powered up.

That night, all backups failed, as the tape drives failed and were marked "down"
in succession.

The next day, we thought there was a problem with the large device, so we had
all jobs go to the smaller unit. The same thing happened, all drives got marked
down.

We deleted all tape units from netbackup and let it rediscover the drives.
It found the 4 in the smaller unit OK, but only 4 of 6 in the larger unit.
All those drives again failed during testing, and were marked down.

Over the weekend we went to disk, which worked OK.

We have:
- checked syslog files, nothing obvious
- 4 distinct HBA cards, so there is no common controller
- cleaned the heads in all drives.
- deleted the contents of /dev/rmt and run devfsadm (this is a solaris8 box,
by the way)

Any suggestions or experience with this problem is appreciated.
I will of course summarize.
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