Adam,
Believe me or not, but I (my folks) saved a lot of space by changing
BLKSIZE to correct one, means SDB. It was not only JCL, but also COBOL.
What is "a lot of space"? It was enough free space on our huge 500GB
DASD box to NOT PURCHASE ANOTHER BOX. Multiply it x2, because we used PPRC.
We also saved a lot of space by elimination of redundant jobs and
datasets. However the main goal was to make batch time shorter.
Few years later we saved a lot of space by using extended format PS and
compression - for selected datasets.
Few years ago we saved a lot of space by using zEDC almost everywhere.
Optimization is still valid, even today. It was extremely valid 30 or
years ago due to DASD capacity and prices.
We did it, we do it, we will do it.
--
Radoslaw Skorupka
Lodz, Poland
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