If all the members in a MAS/EMAS complex have access to the same Coupling Facility, we strongly recommend that you use a Coupling Facility Structure for communication.
Business Value:
The Coupling Facility will manage the exchange of all changes to the file queue among the EMAS members. This will help simplify the management of the EMAS configuration and maximize its performance.
Additional Considerations:
The EMAS member with the lowest system number automatically becomes the CKPT owner, which is responsible for writing all changes to the checkpoint data set(s). The other EMAS members are updated through the Coupling Facility, so they have no need to access the checkpoint data set, avoiding the need for RESERVE/RELEASE.
CA Spool supports System-Managed CF Structure Rebuild. If the Coupling Facility is switched to a backup Coupling Facility, the operating system copies the old structure data to the new structure, providing a planned reconfiguration capability.
CA Spool supports System-Managed CF Structure Duplexing, so a backup copy of the CA Spool CF structure is automatically maintained on a secondary coupling facility. In case of failure, the system can automatically switch to the duplex copy of the CF structure and continue running with no disruption or performance degradation.
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