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z/OS V1R6.0 DFSMS Access Method Services for Catalogs

z/OS V1R6.0 DFSMS Access Method Services for Catalogs

z/OS V1R6.0 DFSMS Access Method Services for Catalogs

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||||||||||||||||||||||||||||||||||||||||||||||||Chapter 31. SETCACHEYou can use the SETCACHE command to:v Make cache available or unavailable to the subsystem <strong>for</strong> caching operationsv Make an addressed device (actuator) eligible or ineligible <strong>for</strong> caching operationsv Make cache unavailable to the subsystem when cache is in pending statev Make nonvolatile storage (NVS) available or unavailable to the subsystemv Activate or deactivate DASD fast write <strong>for</strong> a devicev Make DASD fast write unavailable <strong>for</strong> a device when DASD fast write is inpending statev Make cache fast write access available or unavailable to the subsystemv Schedule DASD writes <strong>for</strong> all modified data in cache and NVS (destagemodified data)v Discard pinned data <strong>for</strong> a device in cache and NVSv Establish a duplex pairv Establish a duplex pair from an existing suspended duplex pairv Reestablish a duplex pair from the primary volume of a suspended duplex pairand an alternate devicev Reset a duplex pair to two simplex volumesv Suspend the primary or secondary volume of a duplex pairv Reinitialize the subsystem, setting all subsystem and device status to the StorageControl’s initial installation default valuesThe <strong>for</strong>mat of the SETCACHE command is:SETCACHENotes:{FILE(ddname)|{VOLUME(volser)+UNIT(unittype)}|UNITNUMBER(devid)}[DEVICE|SUBSYSTEM|NVS|DASDFASTWRITE|CACHEFASTWRITE][ON|OFF|PENDINGOFF][DISCARDPINNED|DESTAGE|REINITIALIZE|SETSECONDARY(devid)|SUSPENDPRIMARY|SUSPENDSECONDARY|RESETTODUPLEX|REESTABLISHDUPLEX(devid)|RESETT<strong>OS</strong>IMPLEX][COPY|NOCOPY][PACE(n)]1. The IBM Enterprise Storage Server (ESS) cache/DFW is on by default and youare not allowed to modify it. In addition, the ESS does not support thedual-copy function. Any SETCACHE command issued <strong>for</strong> the ESS thatattempts to modify the cache/DFW or use dual-copy function will be rejected.2. When the SETCACHE command parameter SETSECONDARY,RESETTODUPLEX, or REESTABLISHDUPLEX is specified, the JCL JOBstatement should include the parameter ’TIME=1440’ because the IDCAMS stepwill very likely exceed the execution time allowed by the installation time limit.3. The SETCACHE command and the DISCARDPINNED, PENDINGOFF,REINITIALIZE, and SUBSYSTEM parameters may be protected by using theSystem Authorization Facility (SAF).© Copyright IBM Corp. 1973, 2004 327

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