In this appendix, we describe the experiences of a large Parallel Sysplex client as they migrated two of their data centers from z10 processors with ICB4 links to z196 processors with InfiniBand links.
Overview of the client experience
For high-speed coupling, ICB4 links offered the best response time prior to the introduction of HCA3 adapters. Because of the large number of CF requests that are generated by the client’s workload (over 300,000 requests a second in one of their sysplexes), they used ICB4 links.
The client’s initial ...