I have a question regarding what kind of tape capacity I should be getting with 
3490E tapes. We
are in the process of implementing ADSM for a variety of clients (Netware, NT, 
and several flavors
of Unix). I am currently backing up about 35 gigs (during the weekly full 
backups) off of six
Netware servers.  The data on these servers consists of application software 
(Lotus, Paradox,
WordPerfect, etc.) and the corresponding data files for these applications. The 
MVS server is
installed on an IBM 9672 CMOS processor with EMC drives for disk pools and IBM 
3490 C22
tape drives.  We are using 3490E tapes and from what I can tell from the 
documentation and
various postings on this list, I should be getting over 2 gigabytes of data on 
each tape.  In reality, I
am getting less than this amount with an average around 1.3 gigs.  Compression 
is turned off on
the client and it is activated on the device class. When I turn it off on the 
devclass, the utilization
drops to about 800 megs per tape.  Reclaimation is not the issue (tapes less 
than 100 utilized)
since I have tapes in the storage pool which are marked as 100% utilized but 
containing only
about 1.3-1.4 gigs of data.

I know the drives are capable of compressing the data more, since our mainframe 
backup system
from Sterling Software, is writing around 2.4 gigs per tape.  This can be 
viewed through CA1 by
looking at the block count and record length.

What do I need to look at and modify to try and get the tape utilization upto 
expected amounts??

Thanks!