If you start getting media errors, or media write error after freezing a
tape, then the best cause of action is to chuck it away !
Seriously, anything I get with 84, 86, ect - tape gets dumped !
I do not risk putting data on suspect tapes..... imagine the horror if
you CANNOT restore from that suspect tape you keep unfreezing !?
Regards
Simon
-----Original Message-----
From: veritas-bu-bounces AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Heathe
Kyle Yeakley
Sent: Wednesday, September 02, 2009 2:25 PM
To: Veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] Frozen Tapes
Hello, I had a question on Frozen media.
First, am I correct in saying that the criteria NetBackup uses to
determine if it should freeze a tape is:
1) NetBackup detects Non-NetBackup data format (So data was written
using straight Unix tar, pax, cpio, or a non-NetBackup commercial app
like Tivoli or Networker)
2) NetBackup detects that there is NetBackup data on the tape, but it's
catalog data, and so it freezes the tape to ensure that the catalog
files aren't overwritten.
3) NetBackup tried to read/write to the tape and experienced more that 3
read/write errors within a 12 hour span of time.
Assuming I'm correct so far, then is the proper method of
troubleshooting Frozen media to:
1) Ensure there isn't some catalog data on the tape.
2) Ensure that the tapes aren't from some other commercial backup
product environment's tape pool (for those of you running multiple
commercial backup applications at a single site).
3) Make sure your tape drives have been cleaned recently.
4) Use bpmedia -m <media id> -unfreeze to unfreeze the tape(s), make a
note of the tape you're unfreezing, and leave it in the scratch pool to
see if it gets used for tonight's backups.
Now for my question: Assuming I was correct on my selection criteria and
my troubleshooting steps, am I correct in saying that if I came in
tomorrow and that media from step 4 was frozen a second time, that it
indicates that the media is more than likely defective? Is there any
other troubleshooting steps anyone would care to add?
Thanks.
- Heathe Kyle Yeakley
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