On my LTO2 tapes I am getting anything from 160GB to over680GB per tape.
The backups that are primarily unix are getting the highest compression.
Compression is done on the drives, not at the server/client level.

Paul

-----Original Message-----
From: Stan Horwitz [mailto:stan AT TEMPLE DOT EDU]
Sent: Wednesday, April 14, 2004 11:09 AM
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: Re: [Networker] volume capacity part 2


On Wed, 14 Apr 2004, adult swim wrote:

>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

Different files compress differently (if at all).
Some files, such as streaming video do not compress at all.
Other files, such as text files compress quite well.

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