Hi All, We are trying to figure out how do XCF couple datasets get serialized in a sysplex. We can see there is a SYSDSN shared SYSTEM(*) ENQs on each sysplex member system, but seems this is only the result of XCFAS doing dynamic allocation for them when the system is being IPLed. So, there must be another serialization protocol that ensures that all sysplex member systems can simultaneously access these datasets safely both for read and for write. Can someone shed some light on this issue? (*) Note: We suspect these SYSDSN ENQs we see, should have been changed to SYSTEMS scope. We only see SYSTEM scope, and may be this is to be attributed to CA-MIM being started later after IPL moment, and not modifying ENQs issued before its startup. I assume that if we were relying on GRS alone, an RNL definition would have changed SYSTEM into SYSTEMS, but I'm not sure whether leaving it SYSTEM could risk something, as we never seen couple datasets getting corrupted.
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