Depending on the network speed and configuration, I can see not using client
compression, but I can't think of a case where you wouldn't want to use tape
drive level compression.  For DLT 4000, format=dlt20c should be specified in the
devc statement.

"Schauerte, Andrew (NM75)" wrote:

> Greetings ADSMer's,
>
> We are currently backing up data to DLT4000 tape library with compression
> off-this was the recommendation of IBM's technical representatives when the
> ADSM server was first installed.  We have a need to reduce the number of
> tapes we are currently using.  Can we turn the compression ON without
> causing problems with Compressed and Uncompressed data together?  Do we have
> to make off of our current volumes read-only and copy them over.   Any hints
> would be extremely helpful.
>                 Thank you!!
>                         Andy Schauerte
> Andrew P. Schauerte
>
> I.T. Analyst
> Information Technology
> (505) 828-5383
> (505) 828-5500 (fax)
> Honeywell
> Defense Avionics Systems