I thought it was media corruption also, but it doesn't appear to be so.
The block size being used is 64 kb on windows server.

James Rohrich
UOP LLC
25 E. Algonquin Rd.
Des Plaines, Illinois 60016
Tel: (847) 391-3958
james.rohrich AT uop DOT com


-----Original Message-----
From: Legato NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU]
On Behalf Of Tim Mooney
Sent: Tuesday, November 15, 2005 5:39 PM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: Re: [Networker] Tape offset


On Tue, 15 Nov 2005 15:26:41 -0600, Rohrich, James
<James.Rohrich AT UOP DOT COM>
wrote:

>At one of my sites, several tapes seem to be reading the label wrong. 
>Instead of picking up the label name on the tape such as Weekly.001 for

>barcode 000200, it picks up the name Weekly.200 for the label name. Two

>batches of tapes appear to have this problem. In all of the cases seen 
>so far there is a tape that is already using that barcode.
>
>The tapes where this occurred are from last december and january, yet a

>tape from 3 years ago is ok and a tape from a week ago is ok. It seems 
>a few tapes have an offset problem where they are reading part of the 
>barcode (last 3 digits) and using it as part of the label name.

This sounds like media database corruption to me.

AFAIK, the bar code isn't stored in the tape label, it's stored with the
tape's entry in the media database.  Otherwise, it wouldn't be possible
for NetWorker to update the barcode associated with a particular volume
without writing to the label on the tape volume, which would effectively
make everything on the tape unavailable (it would be beyond the EOM mark
that NetWorker just wrote when it wrote the new label to the tape).

You should be able to just read the label off the tape using dd.  You'll
need to know the block size NetWorker is using to write to the tapes.
It's probably one of 64K, 96K, or 128K.  You would use something like

  dd if=/dev/nst2 of=/tmp/label bs=128k

You can use "od" or even "less" to view the label, and verify that it's
on the tape in the correct format.  The volume name starts at (octal)
0364.

Also, if you mminfo query by barcode for one of the barcodes, how many
records do you get back?  How about if you mminfo query by volume for
one of the bad volumes?

Tim

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