ADSM-L

Re: Saving data on a defective cartridge

2003-09-19 14:50:54
Subject: Re: Saving data on a defective cartridge
From: Paul Zarnowski <psz1 AT CORNELL DOT EDU>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Fri, 19 Sep 2003 14:22:53 -0400
We have had success doing exactly what Doug suggests below.  Sometimes it
requires deleting more than one file.

First, try doing a move data.  Keep doing a Q PROC to see how many files
(if any) the MOVE DATA succeeds in moving.  Oft times, the bad file is not
the first on the tape.  THis is because of file aggregation.  When MOVE
DATA aborts, it backs out the move of all the files in the aggregation.

Then, do a Q CONTENT COUNT=nn, where "nn" is the number of files
successfully moved by MOVE DATA + 1.  This will tell you the filename.

Then do what Doug suggests - find a way to purge this file from TSM.  We
did what Doug suggests, which is to backup the same file enough times that
the copy of the file mapping the bad spot on tape expires.  Once this
happens, try it all again.  There may be more than one file mapping onto
the bad spot.

It would be much easier of TSM handled this more gracefully.

Or, use copy storage pools.

Or, if you're using DLT, use something else.  We've had good luck with LTO.

..Paul

At 10:38 AM 9/18/2003 -0700, Doug Thorneycroft wrote:
If the move fails at the same spot each time, and audit vol f=y
doesn't help, then you might try using q content to see what the first
few files are. Then backup these same files enough times for the copies
on the tape to expire. This might allow a move to skip over the bad spot.
The next step is to beg management for enough blank cartridges to set up
a copy pool.

Doug Thorneycroft
County Sanitation Districts of Los Angeles County
(562) 699-7411 Ext. 1058
FAX (562) 699-6756
dthorneycroft AT lacsd DOT org


--
Paul Zarnowski                         Ph: 607-255-4757
719 Rhodes Hall, Cornell University    Fx: 607-255-8521
Ithaca, NY 14853-3801                  Em: psz1 AT cornell DOT edu