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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