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Additional info for IBM Pseries Sizing And Capacity Planning: A Practical Guide (IBM Redbooks)
Use it regularly and keep it up to date. This tool provides the only source for actual pricing of pSeries systems. Keep in mind that prices change regularly and often downward. Therefore, check the prices before you make assumptions. 40 Chapter 1: Overview, Concepts, and Approach Chapter 1: Overview, Concepts, and Approach 41 Anyone who performs sizing must use the configurator and fully understand the prices of most components in the current range. To illustrate this, see the following test. 1 Configurator test Guess how much the following items are: • pSeries 630 4-way with the latest faster processors • The difference between a 4-way pSeries 630 and a 4-way pSeries 650 • A 16-way pSeries 670 or 690 • One GB of memory • A Fibre Channel adapter card • One GB of IBM TotalStorage Fibre Array Storage Technology (FAStT) disk It is surprising how wrong many sizing people are when they attempt to guess the answers to these six fundamental items.
Important: System costs are also important when sizing. Price/performance test The configurator test leads to the next important item, regarding price/performance. If the sizing indicates that either of two systems in the range are good solutions, then the price/performance can or should be the deciding factor. The other factor is the flexibility of the system to take upgrades in the future. When sizing, you must be aware of the price/performance across the range. Make sure that you can answer the following questions: • What are the best price/performance pSeries systems in the family?
Figure 1-6: Response time versus requests per second As system resources become busy, tasks start queuing: • When the system is 50% busy, the response time rises 25%. ♦ 50% start immediately ♦ 50% are queued (half start after 50% task) • When the system is 60% busy, the response time is 150%. • When the system is 75% busy, the response time is 250%. • When the system is 80% busy, the response time is 350%. • When the system is 100% busy, there is the possibly for infinite time. The key message for sizing systems or running a production system is to avoid the “knee of the curve”.