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Extra info for IBM Pseries Sizing And Capacity Planning: A Practical Guide (IBM Redbooks)

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The client can make their choice based on funds or start to gather more information. • This is a lower risk situation because we offered more than one solution and have started working to refine the sizing in partnership. 13 Common sizing mistakes Common sizing mistakes are caused by: • Rushing: Sizing is rushed because it is requested at the last moment. 38 Chapter 1: Overview, Concepts, and Approach Chapter 1: Overview, Concepts, and Approach 39 • Wrong size: When under pressure for a “certain answer”, not all the facts are gathered.

In sizing, we determine the hardware requirements and map this to a suitable pSeries model and configuration. The client then must decide whether they want to include Capacity Upgrade on Demand (CUoD). This can be included in three ways: • The initial system has less processor, memory, or both active, but the resources in the sizing estimate are within the system and can be activated later. This may save some clients money because they suspect that they will not actually need all of the resources.

This graph plots for each model (including different numbers of processor) in the family, its relative performance, and its relative price (suitably scaled so that they appear on the same graph). Note the model names were removed from the graph, since they change over time and are irrelevant to our point. Chapter 1: Overview, Concepts, and Approach 41 42 Chapter 1: Overview, Concepts, and Approach Figure 1-10: Price/performance graph In a graph of this nature, you can learn so much: • The price of the system • How performance and prices rise with more processors • The base price of a model and how the incremental prices of more processors rises • This example shows that the pSeries base (box) prices are low, so the client doesn’t have large initial costs when buying boxes that can be upgraded.

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