Intel AS/400 RISC Server, 170 Servers, 7xx Servers manual Disclaimer and Remaining Sections, 3 V5R3

interactive utilization - an average for the interval. Since average utilization does not indicate potential problems associated with peak activity, a second metric (SCIFTE) reports the amount of interactive utilization that occurred above threshold. Also, interactive feature utilization was reported when printing a System Report generated from Collection Services data. In addition, Management Central now monitors interactive CPU relative to the system/partition capacity.

Also in V4R5, a new operator message, CPI1479, was introduced for when the system has consistently exceeded the purchased interactive capacity on the system. The message is not issued every time the capacity is reached, but it will be issued on an hourly basis if the system is consistently at or above the limit. In V5R2, this message may appear slightly more frequently for 8xx systems, even if there is no change in the workload. This is because the message event was changed from a point that was beyond the purchased capacity to the actual capacity for these systems in V5R2.

In V5R1, Collection Services was enhanced to mark all tasks that are counted against interactive capacity (ref file QAPMJOBMI, field JBSVIF set to ‘1’). It is possible to query this file to understand what tasks have contributed to the system’s interactive utilization and the CPU utilized by all interactive tasks. Note: the system’s interactive capacity utilization may not be equal to the utilization of all interactive tasks. Reasons for this are discussed in Section 2.10, Managing Interactive Capacity.

With the above enhancements, a customer can easily monitor the usage of interactive feature and decide when he is approaching the need for an interactive feature upgrade.

2.1.2 Disclaimer and Remaining Sections

The performance information and equations in this chapter represent ideal environments. This information is presented along with general recommendations to assist the reader to have a better understanding of the iSeries server models. Actual results may vary significantly.

This chapter is organized into the following sections:

yServer Model Behavior

yServer Model Differences

yPerformance Highlights of New Model 7xx Servers

yPerformance Highlights of Current Model 170 Servers

yPerformance Highlights of Custom Server Models

yAdditional Server Considerations

yInteractive Utilization

yServer Dynamic Tuning (SDT)

yManaging Interactive Capacity

yMigration from Traditional Models

yMigration from Server Models

yDedicated Server for Domino (DSD) Performance Behavior

2.1.3 V5R3

Beginning with V5R3, the processing limitations associated with the Dedicated Server for Domino (DSD) models have been removed. Refer to section 2.13, “Dedicated Server for Domino Performance Behavior”, for additional information.

IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
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