It's depending on your data.
I think StorageTek told us in general they see:
1:1,5 or better in NT/WIN2K env.
1:2,5 in Unix env.
1:3 - 1:4 in OS/390

We only use NT/WIN2K and we see from 1:1,5 to 1:2 on STK 9940 (should be 
the same as STK 9840)
There are some DataBase backups that have a better compression.

Again, it depends on your data.

/johnny

At 12:21 20-06-2002 -0500, Paul Windsor wrote:
>We recently installed STK 9840 drives as replacements for the soon-to-be
>end-of-life STK SD-3 (REDWOOD). We expected to see better than 2:1
>compression ( according to the blurbs) but are getting much less. We are
>using NetBackup 3.4 on an SGI 3200 with IRIX 6.5.13.    Is anyone else
>seeing better ???
>
>
>Thanks for any help,
>
>paul
>
>
>+---------------------------+-----------------------------------------+
>| Paul Windsor Jr.          | INTERNET/MAIL: windsorpj AT lmtas.lmco DOT com |
>|                           | Fax:      (817) 777-2769                |
>| Computer Sciences Corp.   | Voice:    (817) 777-3122                |
>| 6100 Western Place MZ 2174|           (817) 935-1151                |
>| Ft. Worth, Tx 76107       |                                         |
>+---------------------------+-----------------------------------------+
>
>
>
>_______________________________________________
>Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
>http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu