Dynamic CHPID management (DCM) considerations

DCM CHPIDs used by Workload Manager (WLM) to optimize I/O throughput across an LPAR cluster are identified in the IOCDS by specifying CHPARM equals 01 and IOCLUSTER equals name (where name is an 8-byte EBCDIC cluster identifier).

All DCM CHPIDs are inherently shareable by all LPs but reserved for use by the WLM enabled members of the specified cluster. At completion of an LP activation, its DCM CHPIDs will be in a deconfigured state. When an LP joins a cluster, the DCM CHPIDs in that cluster become available for use by WLM but are not brought online until the need for greater throughput arises. System reset of an LP that was a member of a cluster causes each of the DCM CHPIDs that were online to the LP to be deconfigured. For information on how to define DCM CHPIDs, see IOCP statements for ICP. For allocation rationale of DCM CHPIDs, see redbook z/OS® Intelligent Resource Director, SG24-5952.