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182 IBM BladeCenter JS23 and JS43 Implementation Guide

Table 5-1 Estimated additional VIOS CPU entitlement per shared memory LPAR

Shared memory partition

Shared memory partitions will also require additional CPU entitlement compared

to dedicated memory partitions running the same workload. The additional

amount will be dependent on the memory subscription ration (sum of logical

memory divided by physical memory in the pool) and CMM loan policy settings.

In case where memory is not over committed the additional CPU entitlement will

be minimal.

IBM Workload Estimator (IBM WLE) will be updated to produce estimated sizing

for shared memory partition CPU requirements.

IBM Workload Estimator can be found at:

http://www-947.ibm.com/systems/support/tools/estimator/

5.1.6 Memory weight

The hypervisor considers several variables to allocate and manage memory

across the shared memory partitions. These variables included global and

partition load, global and partition memory pressure, and the one direct user

adjustment memory weight. Similar workloads that run concurrently require

different weights if one partition requires a priority. In an active/inactive scenario

when one shared memory partition uses most of the resources the memory

weight should be equal in both partitions to enhance memory transfer when the

inactive partition becomes active.

5.1.7 Consolidation factors

Once the workload types in a environment have been determined and selected

for consolidation additional factors must be considered:

򐂰 The logical to physical subscription ratio must be suitable for the selected

workloads.

Storage types

Paging rate Internal

storage

Entry level

storage

Mid range

storage

High end

storage

Light 0.005 0.01 0.02 0.02

Moderate 0.01 0.02 0.04 0.08

Heavy 0.02 0.04 0.08 0.16

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