The HSA on our 9672 running OS/390 V2R10 is a whopping 64M, compared to 1344M on the z9 at z/OS V1R8. We eliminated the DYNAMIC attribute on 1024 DASD devices, and that dropped HSA to 1024M. WTF is HSA so ridiculously large on the current hardware/software, for essentially the same I/O config?

Regards,
Tom Conley

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