POWER7 information

HMC and system power-on and power-off procedures

Use one or more of the following procedures to power on or power off your HMC or system.

Power on the HMC

During the process of powering on, the HMC checks to see which managed systems are available and communicating with the console. To ensure that each managed system is available before you power on the HMC, managed systems must be in standby mode or actively operating. Standby mode is indicated by the OK shown in the operator panel after the managed system has the power connected and the initial tests are complete.

Note: If the managed system is in an emergency power off (EPOW) condition, the managed system must be brought to standby mode before the HMC can be used to power on the system.

To power on the HMC, do the following:

  1. Press the Power button once to turn on the power.
  2. When the system has finished the power-on self-test (POST), log in to the HMC.

Power off the HMC

Attention: If possible, shut down all applications and partitions before powering off the system. Using either the power-on button on the control panel or entering commands at the HMC to stop the system can cause unpredictable results in the data files. Also, the next time you start the system, it might take longer if all applications are not ended before stopping the system.

To power off the HMC, log in to the HMC and select Power off. The HMC shuts down any applications that are running, and then turns off the HMC.

Power-on self-test

After power is turned on and before the operating system is loaded, the system does a power-on self-test (POST). This test performs checks to ensure that the hardware is functioning correctly before the operating system is loaded. During the POST, codes indicating the progress of the POST might be displayed. After the POST is complete, the HMC operating machine code loads and a login prompt is displayed.

Power on a system by using an HMC

To power on a managed system, complete the following steps:

  1. In the navigation area, expand the Systems Management icon.
  2. Expand the Servers icon.
  3. Select the check box next to the name of the desired server. The tasks available for that server will be enabled.
  4. From the Tasks menu, choose Operations -> Power on. Follow any additional on-screen instructions.

Power off a system by using an HMC

Attention: If possible, shut down the running logical partitions on the managed system before powering off the managed system. Powering off the managed system without shutting down the logical partitions first causes the logical partitions to shut down abnormally and can cause data loss.
  1. In the navigation area, expand the Systems Management icon.
  2. Expand the Servers icon.
  3. Select the check box next to the name of the desired server. A selection of tasks available for that server will be displayed.
  4. From the Tasks menu, select Operations > Power off. Follow any additional on-screen instructions.
  5. Continue with Remove the power cords.

Install the power cords

Before powering on a system, ensure that the power cords have been plugged in to all of the power supplies on all of the processor enclosures.

Install the cords in the following order:

  1. Secondary 2
  2. Secondary 3
  3. Primary
  4. Secondary 1

Remove the power cords

The system might be equipped with a second power supply. Before continuing with this procedure, ensure that all power sources to the system have been completely disconnected.

  1. Unplug any power cables that are attached to the unit from electrical outlets.
  2. Remove all power cords from all of the processor enclosures starting with the primary processor enclosure (topmost) and then each secondary enclosure working from top to bottom.
Parent topic: Troubleshooting the HMC

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Last updated: Sun, December 17, 2017