Single CPC software availability sysplex

For single CPC configurations, the system can use an ICF to form a single CPC sysplex, providing significant improvement in software continuous operations characteristics when running two z/OS® LPs in data-sharing mode versus one large z/OS image. For these configurations, overall RAS is improved over that provided by a single z/OS image solution. Hardware failures can take down the entire single CPC sysplex, but those failures are far less frequent than conditions taking down a software image, and planned software outages are the predominant form of software image outages in any case. Forming a single CPC sysplex allows software updates to occur in a rolling IPL fashion, maintaining system availability throughout. An LPAR cluster is one example of a single CPC sysplex which has significantly improved system availability over a single LP. For additional benefits provided by an LPAR cluster using IRD technology, see z/OS Intelligent Resource Director, SG24-5952.