using the power button on the operator panel or commands at the hmc to power off the system can cause unpredictable results in the data files. the next initial program load (ipl) will also take longer to complete if all applications in all partitions are not stopped before hand.

    the hmc user interface provides a power-off function to turn off the power to the system. if the system is logically partitioned, aix in each partition may be stopped individually to make repairs. if the system power must be turned off, all of the logical partitions must be stopped. aix provides hot-swap procedures for adapters and devices that support hot-swap removal and installation. you do not have to shutdown a partition that controls an adapter or device that supports hot-swap. individual power components and fans may be serviced with power on for power systems equipped with redundant power and cooling. check removal and installation procedures before servicing the system.

    if the system is operating in a full system partition under aix, typing the shutdown command causes the system to shut down and power off. the -f flag shuts down the system without warning system users. check with the system administrator before using this command. if you cannot use this method, you can power off the system by pressing the power button on the operator panel or the appropriate command at the hmc.