Power Supply Installation Order - IBM x3850 X6 Planning And Implementation Manual

An example in Figure 4-3 shows a correctly balanced and redundant system with four 900W
power supplies installed, connected to 2 separate feeds.
Feed 1
Figure 4-3 Correctly balanced and redundant power
If using a mix of 900W and 1400W power supplies, ensure that power input feeds 1 and 2
have a mix of wattage. This ensures source redundancy and is the only way that mixed power
supplies are supported.
Power supply bay 1: 1400W, Power feed 1
Power supply bay 2: 900W, Power feed 2
Power supply bay 3: 900W, Power feed 1
Power supply bay 4: 1400W, Power feed 2

4.5.4 Power supply installation order

The power supplies are installed in the following order for the x3850 X6:
1. Power supply bay 3
2. Power supply bay 2
3. Power supply bays 1 and 4
The power supplies are installed in the following order for the x3950 X6:
1. Power supply bays 3, 2, 7 and 6
2. Power supply bays 1, 4, 5 and 8
The following rules apply when installing power supplies in the x3850 X6:
For one power supply configuration, install the power supply in bay 3. This configuration
does not support any form of power supply redundancy. A power supply filler must be
installed in bays 1, 2, and 4.
For two power supply configurations, install the power supplies in bays 2 and 3, with each
power supply on separate input power feeds. Ensure that both power supplies are of the
same type in terms of wattage and both must be AC or both DC.
A configuration of three power supplies is not supported.
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IBM System x3850 X6 and x3950 X6 Planning and Implementation Guide
Feed 2