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In computing, a Parallel Sysplex is a cluster of IBM mainframes acting together as a single system image with z/OS. Used for disaster recovery, Parallel Sysplex combines data sharing and parallel computing to allow a cluster of up to 32 systems to share a workload for high performance and high availability. ==Sysplex== In 1990, IBM mainframe computers introduced the concept of a Systems Complex, commonly called a Sysplex, with MVS/ESA SPV4.1 in 1990. This allows authorized components in up to eight LPARs to communicate and cooperate with each other using the XCF protocol. Components of a Sysplex include: * A common time source to synchronize all member systems' clocks. This can involve either a Sysplex timer (Model 9037), or the Server Time Protocol (STP) * Global Resource Serialization (GRS), which allows multiple systems to access the same resources concurrently, serializing where necessary to ensure exclusive access * Cross System Coupling Facility (XCF), which allows systems to communicate peer-to-peer * Couple Data Sets (CDS) Users of a (base) Sysplex include: * Console services – allowing one to merge multiple MCS consoles from the different members of the Sysplex, providing a single system image for Operations * Automatic Restart Manager (ARM) – Policy to direct automatic restart of failed jobs or started tasks on the same system if it is available or on another LPAR in the Sysplex * Sysplex Failure Manager (SFM) – Policy that specifies automated actions to take when certain failures occur such as loss of a member of a Sysplex or when reconfiguring systems * z/OS Workload Manager (WLM) – Policy based performance management of heterogeneous workloads across one or more z/OS image * Global Resource Serialization (GRS) - Communication – allows use of XCF links instead of dedicated channels for GRS, and Dynamic RNLs * Tivoli OPC – Hot standby support for the controller * RACF – Sysplex-wide RVARY and SETROPTS commands * PDSE file sharing * Multisystem VLFNOTE, SDUMP, SLIP, DAE * Resource Measurement Facility (RMF) – Sysplex-wide reporting * CICS – uses XCF to provide better performance and response time than using VTAM for transaction routing and function shipping. * zFS – Using XCF communication to access data across multiple LPARs 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「IBM Parallel Sysplex」の詳細全文を読む スポンサード リンク
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