Initial setup

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Installing the bos.perf.tune fileset automatically creates an initial /etc/tunables/nextboot file.

When you install the bos.perf.tune fileset the following line is added at the beginning of the /etc/inittab file: 
tunable:23456789:wait:/usr/bin/tunrestore -R > /dev/console 2>&1

This entry sets the reboot value of all tunable parameters to their default. For more information about migration from a previous version of AIX® and the compatibility mode automatically setup in case of migration, see the Files Reference guide.