From: Thomas Haddad <thaddad AT COLUMBIAENERGYGROUP DOT COM>
Date: Thursday, January 22, 1998 11:20 AM


>Hi. Im have ADSM v2.1 on AIX 4.2.1. Im just getting started with the
use of of
>dual-drive 3570-B02 tape device. The tape cartridge documents to have
a
>compression capacity of 5G-15G.  When the tape reaches about 35% or
so, it
>becomes full. 35% is about 5G of 15. Looks like its storing data at a
>compression rate of 3:1 but not physically using the entire tape?? Can
I
>literally get 10 or 15G on a tape vol?? Am I misunderstanding the
specs on this
>model?


Are you using client-side compression?  My experience seems to be that
the compressed data is backed up, so the 3570's hardware compression is
not able to compress it further.  Thus, you get the non-compressed
capacity.
--
      /
      /
  /  *  /  Alan Hamilton
 *     *   alanh AT primenet DOT com