1)  if you have netbackup set up to overwrite a tape that has other
types of data on it, it will use it and not freeze it.  Depend on what
your settings are
2) yes it does not like to over write catalogs that is why your cat
tapes are in a different pool  and should always return to that pool so
you don't have this issue
3) again yes

But you missed one
4) if the tape is write protected and it picks it for a backup, loads it
in the drive and sees that it is write protected it will freeze the
tape.  This does not mean that the tape is bad.  This happens to me some
times if I am doing a restore and it is still running when I go home for
the night.  The restore could finish and the backups could the choose it
for a restore.  When I remember this I will try to suspend the tape
before I go home to it will not choose it and freeze it.  So whenever I
do get notice of a frozen tape I check to see if it was write protected
for a restore before I tag the tape as bad.

-----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 8:25 AM
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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