We SUSPEND all tapes as they are ejected from the robot after the 
overnight backups.

That way, if we have to bring them back on site for a restore, NetBackup 
will not try to append further backups to them.  We had many cases where a 
tape was put back into the robot for a restore (physically write-locked); 
NetBackup selected it for backup that night if it was still in the robot 
(in fact, seemed to favour those older tapes).   NetBackup did not like 
trying to write to a write-locked tape.  As they were NDMP drives it did 
not even seem to get a sensible status back to say the medium was 
write-locked, so DOWN'd the drive.

Then it tries to load the same tape in another drive, DOWNs that drive. 
When it has DOWN'd all the drives, the backups all fail.

By SUSPENDing the tapes, we no longer see this problem.    When all the 
images have expired, the tape ceases to be SUSPENDed and can be reused 
with no special action.

FROZEN we will only use for e.g. tapes subject to litigation - we would 
also change the retention to 'infinite' so the images don't expire and so 
don't have to be imported.   FROZEN happens mostly because NetBackup 
decides it does not like the media - it can easily set all the tapes in a 
robot to FROZEN if there is a problem drive.   So mostly we look for 
FROZEN tapes, try and figure out how it happened, and unfreeze them.


William D L Brown




"Kelana Putra Setia" <ksetiaps at yahoo.com.sg> 
Sent by: veritas-bu-bounces at mailman.eng.auburn.edu
01-Jun-2006 13:58
 
To
veritas-bu at mailman.eng.auburn.edu
cc

Subject
[Veritas-bu]  FROZEN vs SUSPENDED






Hi All,

     Any opinions to the differences of a tape in
FROZEN or SUSPENDED state?

     Thanks in advance ....

Cheers,
Kevin Setia


 
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