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Cisco UCS C460 Server Installation and Service Guide
OL-22326-01z
Chapter 3 Maintaining the Server
Installing or Replacing Server Components
Figure 3-6 Removing and Replacing Power Supplies
Power Supply Cold Redundancy
Depending on the power being drawn by the server, one or more power supplies might actively provide
all power to the system while the remaining power supplies are put into a standby state. This is known
as cold redundancy.
The server’s CIMC interface reports the power supply redundancy based on the number of supplies that
are plugged in with AC power applied. For example:
• 2 PSUs: Redundancy lost
• 3 PSUs: Redundancy degraded
• 4 PSUs: Full redundancy
With cold redundancy, depending on the server’s power usage, one or more supplies might actively
provide all power to the system while the remaining supplies are put into a standby state. For example,
if you have two supplies connected to AC power, but the power consumption can be satisfied by power
supply 1, then power supply 2 is put into a standby state.
1 Power supply handle 2 Power supply release lever
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