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6: Maintenance and Upgrade Procedures
Preparing the System for Maintenance or Upgrade
To prepare the system for maintenance, follow these steps:
1. If you are logged on to the system, log out. Follow standard procedures for gracefully
halting the operating system.
2. At your system console, switch from console mode to system control mode by entering the
following command:
$> Ctrl+T
The system will respond with the system control prompt:
L2>
3. From the system control prompt (L2>), power off the system with the following command:
L2> power down
4. Locate the power distribution unit(s) (PDUs) in the front of the rack and turn off the circuit
breaker switches on each PDU.
Returning the System to Operation
When you finish installing or removing components, return the system to operation as follows:
1. Turn each of the PDU circuit breaker switches to the “on” position.
2. At your system console, enter the following command:
L2> power up
3. Verify that the LEDs on the L1 controller(s) turn on and illuminate green and that your
controllers display that the system is powered on for each segment of the procedure, which
indicates that the power-on procedure is proceeding properly.
If your system does not boot correctly, see “Troubleshooting Chart” in Chapter 7, for
troubleshooting procedures.