No compression on Compaq 20/40 DDS DAT drive - EO2007

[Jon White]

I have a Compaq 20/40 GB DDS Dat tape drive that I am using with Backup Exec 2010.  I can't seem to get any compression to work with it.  I have BE set to use hardware compression if available and then use software compression.  However, it does not go over 1:1 compression.  I realize that the type of files affect this, but this 1:1 ratio is on the ENTIRE backup.  Any suggestions?  Thank you!

[thomasr]

Is there any chance you're performing encryption as part of the backup job?  Encrypted data will not compress.

Can yuo download HP's free Library and Tape Tools and create a test data set that is compressible, and then back itup and see what you get?   http://h18006.www1.hp.com/products/storageworks/ltt/index.html