George Dranes wrote:
Thanks for the info. Fortunately, I'm copying between 3390 devices only so IEBCOPY without copymod should be fine. I did try some tests, for example I used copymod to copy my SYS1.LINKLIB and noticed the space utilization decreased. The linklib had been installed from a server pac with a blksize=32760 and i was copying to a dataset with the same blksize so I was confused by the utilization change. Does copymod tidy up things during the copy???
<snip>
On further thought...my guess is that if the directories are the same size and if the device types are identical*, then the reduction in utilization would have to come from the difference between IEBCOPY compress processing (which I'd guess in that case would have to be using COPY, not COPYMOD) and COPYMOD processing.
But I'd have to ask one of the DFSMSdfp guys to be sure, and I've lost track of who owns IEBCOPY.
* Not just defined as 3390's, but actually the same underlying machine type.
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