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About the Power System
•
A system drawer can contain up to three power supplies. The correct position of
the three power supplies is shown in Figure 1–6.
•
One power supply is required in a system with one or two CPUs.
•
A second power supply is required for N+1 redundancy in a single- or dual-CPU
system.
•
Two power supplies are required in a system with three or more CPUs.
•
Two power supplies are required in a system with two PCI card cages.
•
A third power supply is required for N+1 redundancy in a system with three or
more CPUs.
•
A power harness connects the power supplies to the system motherboard, PCI
motherboard, system fans, and drives.
NOTE: Three power supplies provide N+1 redundancy in AlphaServer 4100 systems
with three or four CPUs and in AlphaServer 4000 systems with two PCI card
cages.
Configuration Rules
1-11
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