When disabling latching (LATCH(N)), does Xmanager Cross Communication also have to be disabled (XSYS(N))? I read somewhere that it did.

Document ID : KB000014529
Last Modified Date : 14/02/2018
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Introduction:

This document states whether or not Xmanager Cross Communication should also be disabled when latching is disabled.

Question:

When disabling latching (LATCH(N)), does Xmanager Cross Communication also have to be disabled (XSYS(N))? I read somewhere that it did.

Environment:
z/OS 1.11 and above.
Answer:

Cross System communication (XSYS) between Xmanagers does not have to be disabled to disable latching.

The document that was read referred to a problem record for PDT 1273. R19 Client's who are running without PTF RO79913 on, r18 without PTF RO79934 & r17 without PTF RO79744, will need to disable both the XSYS & LATCH parameters in order to avoid Low Core storage problems. Otherwise, disabling the cross system communication is not needed.