Asynchronous coupling facility duplexing for lock structures
The z17 supports the Asynchronous
Coupling Facility (CF) duplexing to improve the performance of the duplexing of lock structures
by:
- Reducing z/OS, CF, and link utilization overhead costs associated with synchronous duplexing of lock structures
- Improving performance with cross-site duplexing of lock structures at distance
- Maintaining robust failure recovery capability through the redundancy of duplexing.
Asynchronous CF duplexing for lock structures is designed to allow secondary structure updates to
be performed asynchronously with respect to primary updates to:
- Drive out cross-site latencies that exist today when replicating CF data across distance
- Avoid the need for synchronous speed-of-light communication delays during the processing of every duplexed update operation.
Asynchronous CF duplexing for lock structures provides all of the same benefits that system-managed coupling facility structure duplexing provides (see System-managed coupling facility structure duplexing), but with better performance and lower overhead.