Partition time power-on

If the operating system on a logical partition is scheduled to start at a specified time, the server starts automatically if the server is not already powered on. The management partition on an Integrated Virtualization Manager (IVM) managed system or the hosting partition on a Virtual Partition Manager managed system also start automatically if the partitions are not already running. However, other logical partitions are not started automatically at the specified time, even if the logical partitions are set to auto start at system power-on.

Procedures for scheduling operating system power-on

Each operating system has its own procedure for scheduled power-on. For information about how to schedule power-on for a specific operating system, see the link for that operating system in the following table.

Table 1. Procedures for scheduling operating system power-on
Operating system	Procedure for scheduling operating system power-on
AIX®	Run the shutdown command, and specify the time at which the restart must occur, by using the `-t` flag. For more information, see the shutdown command page
IBM® i	Scheduling a system shutdown and restart
Linux	Set power-on time

Hardware behavior for different system configurations

When an operating system starts at a scheduled time, the configuration of the managed system determines how the operating system starts and what is started with the operating system. The following table shows the hardware behavior for each managed system configuration.

Table 2. Hardware behavior when an operating system is scheduled to power on
System configuration	Hardware behavior when an operating system is scheduled to power on
Manufacturing default configuration (MDC), where a single partition owns all the resources of the system	The following activities occur on the server that contains the operating system that is scheduled to power on: The server powers on. The time power-on MDC partition starts.
Server is managed by IVM or Virtual Partition Manager	The following activities occur on the server that contains the client partition that is scheduled to power on: The server powers on if the server is not already on, and the hosting partition starts if the hosting partition has not already started. The time power-on partition or partitions starts. Partitions that are defined to auto start with the server power will not power on automatically when the partition that is scheduled to power on starts. To set multiple partitions to start at the same time, you must set the operating system of each partition to start then.
Server is managed by the Hardware Management Console (HMC)	The following activities occur on the server that contains the partition that is scheduled to power on: The server powers on, if the server is not already on. The time power-on partition or partitions starts. Partitions that are defined to auto start with the server power will not power on automatically when the partition that is scheduled to power on starts. To set multiple partitions to start at the same time, you must set the operating system of each partition to start then.

Last updated: Fri, July 05, 2019