AIX system recovery procedures

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If a machine is unstable after rebooting and the pre520tune attribute is set to enable, delete the offending calls to tuning commands from scripts called during reboot.

To detect the parameters that are set during reboot, look at the /etc/tunables/lastboot file and search for parameters not marked with # DEFAULT VALUE. For more information on the content of tunable files, see the tunables File Format section in Files Reference.

Alternatively, to reset all of the tunable parameters to their default values, take the following steps:

  1. Delete the /etc/tunables/nextboot file.
  2. Set the pre520tune attribute to disable.
  3. Run the bosboot command.
  4. Reboot the machine.