ADSM-L

Re: AW: Different Physical Space Occupied

1999-12-23 09:18:36
Subject: Re: AW: Different Physical Space Occupied
From: Richard Sims <rbs AT BU DOT EDU>
Date: Thu, 23 Dec 1999 09:18:36 -0500
>I wonder why the Physical occupany differes between our tape pool and the
>copy pool.

Thomas - One word: holes.  Expiration can leave voids between viable files
         on serial media.  Over time the media will become increasingly
riddled with such conceptual holes until the reclamation threshold is hit,
whereafter the remaining data on the tape is copied to another tape and
rendered contiguous so as to reduce tape usage and make restorals less
time-costly.
   Richard
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