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AIX 5L Practical Performance Tools and Tuning Guide by IBM Redbooks

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7.1. Data placement and design

There is a vast gap between disk metrics and system metrics. In fact it’s entirely possible to use the same hardware and application and get vastly different results in system performance by varying the data layout. For optimal performance, the data access patterns of the application and the subsequent workload need to match the data layout.

Data layout goals

  • Minimize I/O service times

  • Balance I/O across all disks

  • Keep I/O localized and sequential

7.1.1. AIX I/O stack

The AIX logical volume manager (LVM) provides flexibility in specifying the data layout. A basic understanding of the AIX I/O stack is important in order to effectively monitor and tune an AIX system.

Figure 7-1 on page 426 shows the path a data request ...

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