Installation guide

Chapter 4

Cabling and Power Up

Connecting AC Input Power

The server can receive AC input power from two different AC power sources. If two separate power sources

are available as depicted in Figure 4-6 on page 49, the server can be plugged into the separate power sources,

increasing system reliability should one power source fail. The main power source is defined to be A0 and B0.

The redundant power source is defined to be A1 and B1. See Figure 4-5 for the AC power input label scheme.

NOTE When running the server with a single power source, either A0 and B0 or A1 and B1 should be

used. All other combinations are not supported. Either combination requires two power cords.

Figure 4-5 Power Cord Configuration

The server has five power cord configurations:

• All four power cords installed (preferred configuration)

• Cords A0 and A1 only

• Cords B0 and B1 only

• Cords A0 and B0 only

• Cords A1 and B1 only

A single-power-cord configuration is not allowed.

The power cord configuration is passed to the operating system using the pwrgrd (Power Grid) command.

Each of the five selections in the pwrgrd command matches one of the configurations. The appropriate option

should be selected for the actual line cord configuration. With the correct configuration selected, the LEDs

should be green. When the pwrgrd command is invoked, the following menu is displayed:

prompt> pwrgrd

Power grid configuration preference.

1. Grid A only (Cords A0,B0 required)

2. Grid B only (Cords A1,B1 required)

3. Grids A & B (Cords A0,A1,B0,B1 required)

4. Cords A0 & B0 only

5. Cords A1 & B1 only

A1A0 B0 B1