In each case when you copy dataset from DASD to TAPE ar vice versa, the
data "in transit" are uncompressed. Compression/lack of compression on
source/target doesn't matter.
--
Radoslaw Skorupka
Lodz, Poland
W dniu 2012-04-10 17:00, Victor Zhang pisze:
Chris,
Thanks for the reply.
Using dss is to back extended files to tape/virtual tape.
Your answer said the data read will be expanded. So even by setting compact as
N, the amount of data written to tape/virtual tape will be same, right?
My another question is:
If I set compact=N for storage class, so data sets will not be
compressed/compacted.
If I use same utility to copy it to tape/virtual tape, will there any
difference for the data stream writing to tape?
I already noticed a difference:
By enabling compact option in storage class, I have very low compression ratio
for data written to tape/virtual tape, do you have any idea?
Regards
Victor
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