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CA MIA serializes HCD ACTIVATE across all of the active systems in an MIAplex. When CA MIA detects that an HCD ACTIVATE is underway on the local system, it raises an exclusive ENQ for SYSZIOS/DYNAMIC on all active, external systems in the MIAplex. CA MIA does so to ensure that potential changes to the list of devices managed by CA MIA, affected by the ACTIVATE of a new IODF, only occur on one system in the MIAplex at a time.
Until the IOS501I ACTIVATE CLEANUP COMPLETE is issued for an ACTIVATE being performed on an external system, IOS holds an exclusive ENQ for SYSZIOS/Dynamic. As a result, CA MIA will not be able to serialize a local ACTIVATE with the rest of the MIAplex, until an IOS501I ACTIVATE CLEANUP COMPLETE is issued for the ACTIVATE in progress on the external system and IOS drops its exclusive ENQ for SYSZIOS/DYNAMIC there.
CA MIA issues repeated MIM2161W SERIALIZATION OF SYSZIOS/DYNAMIC REQUESTED messages on the local system and will delay a local HCD ACTIVATE until it can serialize the local ACTIVATE with the rest of the MIAplex by obtaining a SYSZIOS/DYNAMIC ENQ EXCL on all external systems.
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