Now that it has become harder and harder to make the processor faster, IBM is looking for other ways to make their mainframes perform better.
This has resulted in new co-processors for compression and encryption and now also, with the z14 processor, in a new technology called zHyperLink. This new I/O connectivity aims to significantly reduce the I/O response time, while at the same time not increase the processor (CP) load.
This new technology comes with a set of promises and restrictions that will cause you to rethink the design of your storage and replication infrastructure. The days of distance limitations are back, which has big implications for synchronous replication in particular.