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Basically, the z/OS Intelligent Resource Director (IRD) helps
data centers move resources to where the workloads need them
(even in different logical partitions). IRD combines the
powers of three elements: Workload Manager (WLM), Parallel
Sysplex, and PR/SM. It consists of three separate functions:
dynamic channel path management (DCM), channel subsystem I/O
priority queuing, and WLM LPAR CPU management.
The rest of this chapter focuses on this last function of
the IRD, as it is the only one that directly affects RMF
measurements related to CPU utilization in a PR/SM context.
LPAR CPU management, available for LPARs with shared
processors, consists of two parts:
o WLM LPAR weight management, which dynamically adjusts the
relative weights of logical partitions to help workloads
that are missing their goals.
o WLM LPAR Vary CPU management, which dynamically adjusts
the number of online (actually assigned) logical
processors in a partition, so that the CPU resource
available to the LPAR matches the capacity required.
For an LPAR to be a candidate for WLM LPAR CPU management, it
must:
o Be running z/OS in z/Architecture (64-bit) mode
o Be running in LPAR mode on an IBM System z
o Be using shared standard CP processors
o Not be hard capped
o Be in WLM goal mode
o Be in a parallel sysplex
WLM LPAR CPU Management functions occur within an LPAR
cluster, which is a set of logical partitions running on the
same CPC and belonging to the same parallel sysplex. Other
LPARs (outside of the cluster) are not affected.
1 - WLM LPAR Weight Management
2 - WLM LPAR Vary CPU Management
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