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

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2.3. Disk I/O performance

A lot of attention is required when the disk subsystem is designed and implemented. For example, you will need to consider the following:

  • Bandwidth of disk adapters and system bus

  • Placement of logical volumes on the disks

  • Configuration of disk layouts

  • Operating system settings, such as striping or mirroring

  • Performance implementation of other technologies, such as SSA

2.3.1. Initial advice

Do not make any changes to the default disk I/O parameters until you have had experience with the actual workload. Note, however, that you should always monitor the I/O workload and will need to balance the physical and logical volume layout after runtime experience.

There are two performance-limiting aspects of the disk I/O subsystem ...

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