IBM 890 manual Intelligent Resource Director, zSeries IRD Scope, LPAR CPU Management

•IC. The Internal Coupling channel emulates the Coupling links providing connectivity between images within

a single server. No hardware is required, however a minimum of 2 CHPID numbers must be defi ned in the IOCDS. IC links provide the fastest Parallel Sysplex con- nectivity. The z890 supports up to a maximum of 32 ICs.

Intelligent Resource Director

Exclusive to IBM’s z/Architecture is Intelligent Resource Director (IRD), a function that optimizes processor and channel resource utilization across Logical Partitions (LPARs) based on workload priorities. IRD combines the strengths of the zSeries LPARs, Parallel Sysplex clustering, and z/OS Workload Manager.

IRD has three major functions: LPAR CPU Management, Dynamic Channel Path Management, and Channel Sub- system Priority Queuing.

zSeries IRD Scope

LPAR Cluster

z/OS

z/OS

Linux

OS/390

ICF

	STI	STI-3
M	STI
		MUX
B
	STI
A
	STI	I/O Cage
4 x 2.0 GBps
	STIs

ICB-4 (2.0 GBps)

z990/

z890

ICB-3 (1 GBps)

ICB-3 (1 GBps)z900/

z800

LPAR CPU Management

LPAR CPU Management allows WLM working in goal mode to manage the processor weighting and logical processors across an LPAR cluster. CPU resources are automatically moved toward LPARs with the greatest need by adjusting the partition’s weight. WLM also manages the available processors by adjusting the number of logical CPs in each LPAR. This optimizes the processor speed

Intelligent Resource Director uses the concept of an LPAR cluster, the subset of z/OS systems in a Parallel Sysplex cluster that are running as LPARs on the same zSeries server. On a z890/ z990, systems that are part of the same LPAR cluster may be in different LCSSs. In a Parallel Sysplex environment, Workload Manager directs work to the appropriate resources based on business policy. With IRD, resources are directed to the priority work. Together, Parallel Sysplex technology and IRD provide the fl exibility and responsiveness to on demand e-business workloads unrivaled in the industry.

and multiprogramming level for each workload, helps reduce MP overhead, and helps give z/OS more control over how CP resources are distributed to help meet your business goals.

z/OS 1.2 enhances the LPAR CPU management capa- bilities and will allow the dynamic assignment of CPU resources to non-z/OS partitions outside the z/OS LPAR cluster such as Linux or z/VM.

Dynamic Channel Path Management

In the past, and on other architectures, I/O paths are

defi ned with a fi xed relationship between processors and

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