> 
> I am sorry if this was recently covered, but I am still a bit
> confused.   I have some classes which backup highly compressed data using
> using non-hardware compression.   It seems I usually get about 40G/tape,
> which is right on target, however, many of these tapes used to be used by
> DLT7000 drives, and it seems that I can't write more than 35G to them:
> 
> Example
> 
> DJH558  DLT      TLD      0       41     -       3     39195823 FULL
> DJH582  DLT      TLD      0       30     -       2     34462386 FULL

> Do I need to manually override the density for all these tapes, or is
> there an easier solution?

I don't know the behavior of NB in this situation.  It may take a
recycled tape and forward past a label before doing any writes.  If it
does this, it will never change the density on the tape.

Instead *all* of the tape must be overwritten.  Easiest to me would be
to have a script..

1) Erase the volume from the NB databases.
2) Place the volume in a drive
3) mt rewind the volume (guarantee it's at BOT)
4) dd if=/dev/zero of=/dev/rmt/Xcbn count=10
5) mt offline the volume
6) get NB to recognize it as a new tape.

Do you have the lights on the side of your DLT8000s?  (some jukeboxes
don't show the lights).  If so, you can verify the density.

You can press the force override density to do this also, but it will
have no effect if you're writing anywhere other than BOT.  So allowing
NB to mount the tape and then pressing the buttons on the drive may not
succeed.

-- 
Darren Dunham                                           ddunham AT taos DOT com
Unix System Administrator                    Taos - The SysAdmin Company
Got some Dr Pepper?                           San Francisco, CA bay area
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