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1 Mike Poil commented Permalink

When I was a VM/VSE sysprog, I seem to remember that a small change to the IPL, such as additional ADDs, could result in the 24-bit Shared Area size growing by 1MB when UNUSED was 0K before the change. I always advised customers to keep about 64K free for safety. Is this still relevant?

2 Ingolf24 commented Permalink

After IPL complete (and allocation of Shared Partitions) the "UNUSED" space can not be used by any VSE resources. <br /> The shared area size is dependent on the resources defined during IPL. WIth z/VSE 4.3 we moved I/O control blocks into 31 bit <br /> virtual storage. Therefore the requirements for I/O devices are reduced.