6. Close the rack door at the rear of the system.
Replacing the 9117-MMB, 9117-MMC, 9179-MHB, or 9179-MHC power
supply with the power turned on
Learn how to replace a power supply with the system power turned on.
Attention: Two power supplies must be present in the system to power on the system unit. If one power
supply fails, or you have a system failure that does not stop the fans, the system continues to operate.
You can remove and replace the power supply with the system power turned on if it is done in less than
5 minutes. After 5 minutes, the system turns off the power to prevent the system from overheating. If the
system power is turned off, go to “Replacing the 9117-MMB, 9117-MMC, 9179-MHB, or 9179-MHC power
supply with the power turned off” on page 4.
If your system is managed by the Hardware Management Console (HMC), use the HMC to replace a
power supply. For instructions, see Exchanging a part by using the Hardware Management Console.
If your system is managed by the IBM Systems Director Management Console (SDMC), use the SDMC to
replace a power supply in the server. For instructions, see Replacing a part by using the Systems Director
Management Console.
If your system is not managed by an HMC or SDMC, complete the following steps to replace a power
supply in a system while the system power is turned on:
1. To remove the power supply, see “Removing the 9117-MMB, 9117-MMC, 9179-MHB, or 9179-MHC
power supply with the power turned on” on page 3.
2. Perform the prerequisite tasks, as described in Before you begin.
3. Attach the wrist strap.
6 Power Systems: Power supplies for the 9117-MMB, 9117-MMC, 9179-MHB, or 9179-MHC
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