Powering on and powering off

Provides information for powering on and powering off the system.

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 Hardware Management Console (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.

Install the power cords

Note:

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:

Secondary 2
Secondary 3
Primary
Secondary 1

Power on a system using an HMC

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

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

Power on a system without an HMC

To start a system that is not managed by an HMC, follow these steps: Press the power button A, as shown in the following figure, on the control panel. Observe the following after pressing the power button: The power-on light begins to blink visibly faster. The system cooling fans are activated after approximately 30 seconds and begin to accelerate to operating speed. Progress indicators, also referred to as checkpoints, appear on the control panel display while the system is being started. The power-on light on the control panel stops blinking and remains on, indicating that system power is on.

Tip:

The system attention light G, as shown in the previous figure, does not appear on the control panel on the model 570.

On a rack-mounted system unit, open the front rack door, if necessary. On a stand-alone system unit, open the front door.
Before you press the power button on the control panel, ensure that power is connected to the system unit as follows:
- All system power cables are connected to a power source.
- The power-on light F, as shown in the following figure, is slowly blinking.
- The top of the display D, as shown in the following figure, contains 01 V=F.
Figure 4. Control Panel with labels

Tip: The system attention light G, as shown in the previous figure, does not appear on the control panel on the model 570.
Press the power button A, as shown in the following figure, on the control panel.
Observe the following after pressing the power button:
- The power-on light begins to blink visibly faster.
- The system cooling fans are activated after approximately 30 seconds and begin to accelerate to operating speed.
- Progress indicators, also referred to as checkpoints, appear on the control panel display while the system is being started. The power-on light on the control panel stops blinking and remains on, indicating that system power is on.

Power off a system 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.

In the Navigation area, expand the Systems Management icon.
Expand the Servers icon.
Choose the check box next to the name of the desired server. A selection of tasks available for that server will be displayed.
From the Tasks drop down menu, choose Operations -> Power off. Follow any additional on-screen instructions.
Continue with Remove the power cords

Power off a system without an HMC

If there is an operating system running, proceed with step 2. Otherwise, press the power button A, as shown in Figure 4. The system power turns off. Proceed to step 4
Log in to the system as a user with the authority to run the shutdown command.
At the command line, enter one of the following commands:
- If your system is running AIX, type shutdown.
- If your system is running Linux, type shutdown -h now.
The command stops the operating system. The system power turns off.
The power-on light begins to slowly blink, and the system goes into a standby state.
Continue with Remove the power cords.

Remove the power cords

Table 34.
Unplug any power cables that are attached to the unit from electrical outlets. 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. Important: 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. (L003) or