Confused,

The 2 to 1 compression ratio that vendors use in marketing is just a guess
about the average compression a customer will get.  The actual compression
ratio you achieve depends on the kinds of files you are backing up.

The compression algorithm works largely by detecting repeating patterns in
the file being compressed and substituting a token for those patterns that
indicates how to restore them when the file is uncompressed.  Something like
a graphics file or DB file may contain large areas of repeating patterns and
you may get 10 to 1 or better compression but an executable file may contain
almost no repeating patterns and you may get no compression.

The mixture of files you back up determines the ultimate compression ratio
you achieve.  The numbers you gave don't seem unreasonable to me.

Dave

David Werth
Garmin AT, Inc
(formerly: UPS Aviation Technologies)
(formerly: II Morrow)
Salem, Oregon
dave.werth AT garmin DOT com

-----Original Message-----
From: adult swim [mailto:adult_0_swim AT YAHOO DOT COM]
Sent: Wednesday, April 14, 2004 9:42 AM
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: [Networker] volume capacity part 2

After feedback from the list I realized that I was
using data compression incorrectly by using hardware
compression as well as unix with compression
directives, that has been changed to hardware
compression only.

In addition I verified that I have all 100/200 LTO
Ultrium tapes loaded in the Jukebox but....

I am seeing tape capacity figures that are all over
the place. Some show Full at 181GB and 169GB and that
makes sense but I am also seeing some show Full at
335GB and 362GB which does not make sense.

If I have a 100GB tape that should only be able to
show 200GB max compressed how am I getting figures
over 200GB? any ideas?

Confused







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