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Introduction z/OS MVS Setting Up a Sysplex SA23-1399-00 |
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A sysplex is a collection of z/OS systems that cooperate, using certain hardware and software products, to process workloads. The products that make up a sysplex cooperate to provide higher availability, easier systems management, and improved growth potential over a conventional computer system of comparable processing power. The cross system coupling facility (XCF) component of z/OS provides simplified multisystem management. XCF services allow authorized programs on one system to communicate with programs on the same system or on other systems. If a system fails, XCF services also provide the capability for batch jobs and started tasks to be restarted on another eligible system in the sysplex. Server Time Protocol (STP) or a Sysplex Timer is required to synchronize the time-of-day (TOD) clocks for systems in a sysplex that run on different processors. Note, however, that Sysplex Timer connections are no longer supported starting with the z196/z114 servers. In a Parallel Sysplex, central processing complexes (CPCs) are connected through channel-to-channel (CTC) communications or through a coupling facility. A coupling facility enables parallel processing and improved data sharing for authorized programs running in the sysplex. The cross-system extended services (XES) component of MVS™ enables applications and subsystems to take advantage of the coupling facility. A shared sysplex couple data set records status information for the sysplex. |
Copyright IBM Corporation 1990, 2014
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