HMC and system power-on and power-off procedures

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.

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

To power off the HMC, choose one of the following navigation options depending on the interface type of the HMC:

• If you are using an HMC Classic or HMC Enhanced interface, complete the following steps:
  1. In the navigation area, open HMC Management.
  2. In the Operations area of the contents area, select Shut Down or Restart. The Shutdown or Restart window opens.
  3. Select Shutdown HMC, and then click OK.
• If you are using an HMC Enhanced+ interface, complete the following steps:
  1. In the navigation area, click the HMC Management icon , 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 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, choose one of the following navigation options depending on the interface type of the HMC:

• If you are using an HMC Classic or HMC Enhanced interface, complete the following steps:
  1. In the navigation area, click Systems Management > Servers.
  2. In the content pane, select the required managed system.
  3. Click Tasks > Operations > Power On.
  4. Follow any additional on-screen instructions.
• If you are using an HMC Enhanced+ interface, complete the following steps:
  1. In the navigation area, click the Resources icon , and then click All Systems.
  2. In the content pane, select the required 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

To power off a managed system, choose one of the following navigation options depending on the interface type of the HMC:

• If you are using an HMC Classic or HMC Enhanced interface, complete the following steps:
  1. From the navigation area, click Systems Management > Servers.
  2. From the content pane, select the required managed system.
  3. Click Tasks > Operations > Power Off.
  4. Follow any additional on-screen instructions.
  After the managed system has completed its power off sequence, you can remove the power cords if needed. For information about how to remove the power cords, see Remove the power cords.
• If you are using an HMC Enhanced+ interface, complete the following steps:
  1. In the navigation area, click the Resources icon , and then click All Systems.
  2. In the content pane, select the required 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 has completed its power off sequence, you can remove the power cords if needed. For information about how to remove the power cords, see 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.

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.