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Extra resources for IBM Pseries Sizing And Capacity Planning: A Practical Guide (IBM Redbooks)
Sample text
Table 1-3: Levels of sizing accuracy Level Level 0 34 Accuracy 500% Description Pure guess work Input data None or nearly none Time for the sizing 1 second Chapter 1: Overview, Concepts, and Approach Chapter 1: Overview, Concepts, and Approach Level 1 Level 2 100% Guess 30 to 40% Rough estimate Level 3 20% An opinion or estimate Level 4 10% Fairly accurate with known risks Level 5 2% Major problems if this is wrong Segmentation only Data from previous levels plus basic sizing data Data from previous levels plus detailed data or estimations of transactions rates Detailed break down of system based on measurements Transaction measured in clock cycles and physical and logical disk I/O 35 10 minutes 2 hours 8 hours to 2 days 5 days minimum 6 months minimum Each level of sizing details increases the accuracy (and decreases the inaccuracy) but requires more detailed relevant facts on which to base the sizing.
The main concern of a disaster recovery configuration is the data bandwidth between sites and data synchronization. These are not the concern of the normal sizing request. 17 Capacity Upgrade on Demand Fortunately, this is not really a sizing problem. 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.
Table 1-3: Levels of sizing accuracy Level Level 0 34 Accuracy 500% Description Pure guess work Input data None or nearly none Time for the sizing 1 second Chapter 1: Overview, Concepts, and Approach Chapter 1: Overview, Concepts, and Approach Level 1 Level 2 100% Guess 30 to 40% Rough estimate Level 3 20% An opinion or estimate Level 4 10% Fairly accurate with known risks Level 5 2% Major problems if this is wrong Segmentation only Data from previous levels plus basic sizing data Data from previous levels plus detailed data or estimations of transactions rates Detailed break down of system based on measurements Transaction measured in clock cycles and physical and logical disk I/O 35 10 minutes 2 hours 8 hours to 2 days 5 days minimum 6 months minimum Each level of sizing details increases the accuracy (and decreases the inaccuracy) but requires more detailed relevant facts on which to base the sizing.