Hi Tom,

It's fine if you let the hardware take care of the compression for you
at a tape drive level. (It will help the speed of the backup process - and
not waste any resources on the netware/client side of things).
You will not really see any improvement by compressing the data at the
client level - data more than likely will grow.
Because the compression algorithm used by the ADSM client and the
3570 tape drive and the utilities used to compress data on P.C.'s is the
same - (ZL) you will not gain anything.
The reason you are seeing better compression ratios on the NT machines
than on Novell - look at the Novell server - it's most likely a file server
storing a lot of compress(pk zipped) images.

Hope this clears it up a bit...

Regards
Christo Heuer
Johannesburg
South Africa


>I have 3570 devices (models B and C) running ADSM v3.1.
>They have been operational for a short time, but I have questions about
client
>compression.
>The drives are defined as FORMAT=DRIVE and DEVTYPE=3570.
>
>In regards to Netware (4.11) clients, how can I maximize my compression
gain??
>I attempted to leave COMP=NO at the server (for the node) and COMP OFF in
the
>OPT file and let the hardware take
>over with compression. Looks Iike I average about 7 or 9G max on a tape
>cartridge as they became full.
>Next I want to put COMP ON in the OPT file and see if I get more
compression..
>Any help?
>
>I think my NT clients gain an overall better compression rate than my
Netware
>clients..hmmm!!
>
>Looks like compression gain is driven by  the type of client(data),
>hardware...etc..