IBM 835, 890, 870 manual Performance Considerations, CPU Utilization

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Performance Considerations

CPW

Relative performance measurements are derived from commercial processing workloads (CPW) running on iSeries servers. CPW is representative of commercial applications, particularly those that do significant database processing in conjunction with journaling and committment control. CPW values may not be realized in all environments.

IBM will publish the Processor CPW value for the start-up number of processors as well as a Processor CPW value that represents the full capacity of the server when all processors are active (Start-up + Stand-by). IBM is not publishing Processor CPW values associated with each incremental processor activation. If needed, for capacity planning purposes, one could calculate the approximate CPW associated with each activated processor by subtracting the Processor CPW published for the start-up number of processors from the maximum Processor CPW for the server and then dividing by the number of stand-by processors.

CPU Utilization

Standby processors are NOT considered within the various system functions that report CPU utilization percentages until they are activated and assigned to a partition.

CPU percent is a calculated metric based on the amount of time the processor was active within an elapsed time. This is normally reported as a percentage where 100% indicates the processor was busy for the entire sample interval. When multiple processors are present, CPU time must be adjusted to be the average usage of all processors so that utilization is always reported as the percentage of total available capacity.

5250 OLTP (“interactive”) capability is determined by the edition feature purchased. This capability is not impacted by the number of standby processors and does not change when standby processors become active. Interactive utilization reported as a percentage of interactive capability is not affected by the Capacity on Demand technology. Within Management Central, this metric is called “CPU Utilization (Interactive Feature)”.

Interactive CPU utilization is also reported as a percentage of total system CPU. Within Management Central this metric is called “CPU Utilization (Interactive Jobs)”.

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12/15/2003

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Contents Important Important Important 12/15/2003 Preface Purpose of Planning Guide Planning Guide Feedback Where to Get HelpPlanning Ahead ISeries Capacity PlanningWhat’s new Capacity Upgrade on Demand CUoDProcessor Utilization CUoD and On/Off CoDCUoD aka. permanent capacity on demand Ordering permanent capacityTrial Capacity is not offered on new models Permanent Capacity PricingGuidelines for Ordering Permanent Capacity Guidelines for Ordering a POD Activation FeatureStep-by-Step Instructions Ordering Permanent CapacityFax Number 12/15/2003 Important Considerations Converting Hardware Features Converting FeaturesCancellation of Orders Processor Failures Results of Moving iSeries Hardware Moving HardwareOltp Capacity Logical PartitionsAssign Processors 12/15/2003 SW Licenses CPU Utilization Performance ConsiderationsPM/400 Management Central ToolsWorkload Estimator License License, Warranty, MaintenanceWarranty MaintenanceCE Maintenance Instructions Model 825, 870, 890 with V5R2 Maintenance InstructionsCE Conversion Instructions Install new Hardware and IPLWait 5 Minutes Yes CE Upgrade Instructions
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