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Identify the High Availability Requirements
SPU-level Enhanced Power Availability
At the SPU level, enhanced power availability is achieved through the
n+1 hot-swappable power supplies.
Two power supplies are required for normal rp7400 system operation
and in order to allow the system to boot. The third power supply is a
redundant power supply that provides the n+1 capability.
Any one of the power supplies can fail without affecting system
performance, and can be replaced while the system is on-line. Single
point of failure is reduced to the PDU or PowerTrust UPS to which the
power supply power cords are connected.
Cabinet-level Enhanced Power Availability
At the equipment cabinet level, enhanced power availability is achieved
by interweaving the three power supply power cords across different
branch circuits in the PDUs. The following illustration shows how three
SPUs can be connected to three 30A PDUs for high availability:
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