>
> We use LTO generation one tapes and tape drives. I am confused by the
> display of their capacity.
>
> Some tapes have 139 GB on it and it displays as full
> Some tapes have 180 GB on it and it displays as full
> Some tapes have 129 GB on it and it displays as 100% appendable
>
> Does anyone have any explaination for this?

Compression on tapes depends on the data.  Networker just feeds data to
the volume until it doesn't fit.  If you feed an empty database, you can
easily get over 400% compression.  If you feed lots of .zip, .jpg, .mp3
files, positive compression probably won't happen.

'full' means that Networker thinks the tape took all the data that would
fit.

'100%' means that an amount of data greater than the volume capacity has
been written to the volume.  Data will continue to be written until the
drive informs the system that the tape is full.

You may adjust the volume default capacity to better reflect how much
space is generally available on your volumes, but that figure only
affects reported percentages.  It does not affect the actual capacity
used by Networker.

--
Darren Dunham                                           ddunham AT taos DOT com
Senior Technical Consultant         TAOS            http://www.taos.com/
Got some Dr Pepper?                           San Francisco, CA bay area
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