114 IBM System x3850 X6 and x3950 X6 Planning and Implementation Guide
4.5.2 Power supply redundancy
The four x3850 X6 power supply bays are divided into two power groups to support N+N
power supply and power feed redundancy (where N = 1 or 2 depending on your system
configuration and load).
The power supply bays are numbered from left to right when viewed from the rear of the
chassis as shown in Figure 4-2. Power supplies installed in bays 1 and 3 belong to Group A
(red) while those installed in bays 2 and 4 belong to Group B (blue).
Figure 4-2 Grouping of the power supplies in the x3850 X6
There are four types of power supplies supported:
900W AC
1400W AC
1400W AC for high altitude above 5,000 meters
750W DC
The x3850 X6 and x3950 X6 support three modes of redundancy based on the power supply
configuration, system load, and the Power Policy configuration controlled by the IMM2:
Non-redundant
Fully system redundant
Redundant with reduced performance (throttling)
The default configuration setting for both AC and DC models is Non-Redundant with
Throttling enabled.
You can set and change the Power Policy and System Power Configurations using the IMM2
web interface. The power configurations and policies can be changed via the web, CIM, and
ASU interfaces. These settings cannot be changed by UEFI.
For information about how to connect to the IMM2, see 7.2, “Integrated Management Module
II (IMM2)” on page 201. For information about the power policy in the IMM2 and changing the
settings, see 4.5.5, “Power policy” on page 117.
Depending on your load and power requirements, the x3850 X6 server supports the following
power supply installations:
One 900W
One 1400W
Two 900W
Two 1400W
Two 900W and two 1400W
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