HMC and system power-on and power-off procedures

Use one or more of the following procedures to power on or power off your Hardware Management Console (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, you must power off the managed system before you use the HMC to power on the system.

To power on the HMC, complete the following steps:

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

Power off the HMC

To power off the HMC, complete the following steps:
  1. In the navigation area, click the HMC Management icon HMC Management, and then click Console Management.
  2. In the Management area of the content pane, click Shut Down or Restart the Management Console.
  3. Click Shutdown HMC, and then click OK.

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 checks to ensure that the hardware is functioning correctly before the operating system is loaded. During the POST, codes that indicate 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, click the Resources icon Resources, and then click All Systems.
  2. In the content pane, select the managed system name.
  3. In the navigation area, click System Actions > Operations > Power On.
  4. 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 you power 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.
To power off a managed system, complete the following steps:
  1. In the navigation area, click the Resources icon Resources, and then click All Systems.
  2. In the content pane, select the managed system name.
  3. In the navigation area, click System Actions > Operations > Power Off.
  4. Follow any additional on-screen instructions.
After the managed system completes its power off sequence, you can remove the power cords if needed. For more information about how to remove the power cords, see Remove the power cords.

Install the power cords

Before you power on a system, ensure that the power cords are plugged in to all of the power supplies on all of the processor enclosures.

Remove the power cords

The system might be equipped with a second power supply. Before you continue with this procedure, ensure that all power sources to the system are 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.