Activation

A reset profile includes information for activating a CPC and its images (logical partitions).

• In the reset profile, after selecting an LPAR IOCDS (A0-A3) deemed valid for secure operation using the Input/Output (I/O) Configuration task, the operating mode selected must be logically partitioned (LPAR).
• Dynamic I/O changes can be disabled on the Dynamic Page of the Power-on Reset task displayed during Power on Reset of the CPC. Ensuring the Allow dynamic changes to the channel subsystem input/output (I/O) definition) is not selected, disables dynamic I/O for the CPC. Globally disabling dynamic I/O configuration narrows the control of the I/O configuration control parameter to only controlling a logical partition's reading and writing of IOCDS.
• Workload Manager (found on the Processor page of the Image profile) should not be enabled for Isolated logical partitions.

  Enabling Workload Manager (WLM) enables Dynamic CHPID Management (DCM) to optimize I/O throughput across an LPAR cluster by sharing CHPIDs among partitions who have joined the cluster. Any logical partition that is WLM enabled may join the cluster and therefore share CHPIDs reserved for use by members of the specified cluster. Furthermore, partitions within a cluster may issue a special DIAGNOSE instruction to obtain information about other partitions within the same cluster even when Global Performance Data Authority is not enabled. See The characteristics of logical partitions for more information.