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Chapter 9 Power Supply Unit (PSU) Replacement 9-9
9.2 Active Replacement and Hot Replacement
Caution – Each cabinet contains multiple PSUs so that the power output specifications are
satisfied even if one PSU fails. However, avoid continuing operation for a long period with a
faulty PSU left in the cabinet.
The active replacement procedure and hot replacement procedure for the PSUs are the same.
The procedure is as follows.
1. Unlock and open a door of the server. (See Chapter 5)
Caution – Before touching a FRU or dummy (filler) unit, see Section 1.4, “Antistatic
Precautions” on page 1-9 and be sure to wear the antistatic wrist strap. Failure to do so might
result in serious damage to operating domains.
2. Display the maintenance menu, and select the swap target PSU. (The maintenance
menu is used up to Step 9.)
The fieldeng permission is required for executing this command.