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???
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