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Performance Tools Guide and Reference - Kernel Tuning
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Performance Tools Guide and Reference
Kernel Tuning
Beginning with AIX 5.2, you can make permanent kernel-tuning changes
without having to edit any rc files. This is achieved
by centralizing the reboot values for all tunable parameters in the /etc/tunables/nextboot stanza file. When a system is rebooted, the values
in the /etc/tunables/nextboot file are automatically
applied.
The following commands are used to manipulate the nextboot file and other files containing a set of tunable parameter values:
The tunchange command
is used to change values in a stanza file.
The tunsave command
is used to save values to a stanza file.
The tunrestore is used
to apply a file; that is, to change all tunables parameter values to those
listed in a file.
The tuncheck command
must be used to validate a file created manually.
The tundefault is available
to reset tunable parameters to their default values. The preceding commands work on both current and reboot values.
All five tuning commands ( no , nfso , vmo , ioo ,
and schedo ) use a common
syntax and are available to directly manipulate the tunable parameter values.
Available options include making permanent changes and displaying detailed
help on each of the parameters that the command manages.
SMIT panels and Web-based System Manager plug-ins are also available to manipulate
current and reboot values for all tuning parameters, as well as the files
in the /etc/tunables directory.
The following topics are covered in this chapter:
Migration and Compatibility
Tunables File Directory
Tunable Parameters Type
Common Syntax for Tuning Commands
Tunable File-Manipulation Commands
Initial setup
Reboot Tuning Procedure
Recovery Procedure
Kernel Tuning Using the SMIT Interface
Kernel Tuning using the Performance Plug-In for Web-based System Manager
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