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Re: [Networker] Tapes are labelled but not used, 0% appendable

2008-09-05 12:27:07
Subject: Re: [Networker] Tapes are labelled but not used, 0% appendable
From: Davina Treiber <Davina.Treiber AT PEEVRO.CO DOT UK>
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Date: Fri, 5 Sep 2008 17:17:31 +0100 
Ali wrote:

Hi NW Gurus,
We find a number of Tapes (5 to 10 each day) in the library that are labelled by NW but never written to. We noticed this recently and looks like this has been happenning for quite sometime and we have been shipping 0% appendable tapes offsite for 30 days upto 7 years . (I recommend you should also keep an eye on it).
has anyone seen this ? our group parallelism is set to 16 and Tape drives are LTO2 in ADIC i2K library on a NW 7.3.3 running on Soalris 10 and another environment is Windows 2003 with same issue.
I can guess why NetWorker does this. It issues a mount request based on the number of streams outstanding. It kicks of label/mount operations for the appropriate number of tapes, but some operations take longer than others. Before all the operations have completed some of the smaller save sets have already finished so not all the tapes are needed. These tapes get labelled and never used.
This should not cause a problem, as next time a tape is needed, the 0% tape will get mounted, probably the next day. However if your procedures for offsiting are so badly broken that they call for empty tapes to be offsited this will never happen.
NetWorker is not at fault in this case, your procedures are. I suggest you fix them, and also recall all the 0% tapes you have previously offsited. 

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