HP Netserver L Server series - Manual (Page 49)

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7 Installing Additional Power Supplies
The NetServer is shipped with two power supply cages. One power supply cage
contains two power supplies, and one power supply cage contains one power
supply, with the empty half covered with a protective panel. The NetServer
operates with just three power supplies; adding an additional power supply makes
continuous operation possible if a power supply fails.
Figure 7-1. Power Supplies and Optional Power Supply Bay
If you desire an additional power supply for redundancy, you can purchase the
HP NetServer Power Supply Upgrade Kit.
Installing an Additional Power Supply
Refer to the HP Power Supply Upgrade Kit Installation Guide for instructions on
how to install additional power supplies.