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Power Supply Redundancy

Power supply redundancy is an important feature of the Sun Fire X4640 server. Redundancy allows for continued server operation in the event of a power supply failure. The server has capabilities for up to four power supplies. When configuring your server for power supply redundancy, consider the following guidelines.

Number of PSUs | Slots Populated | Quality of Redundancy
--- | --- | ---
1 | PS0 | The system will not power on with only one operational power supply.
2 | PS0 and PS1 | Poor (no redundancy)
3 | PS0, PS1, and PS2 | Good
4 | PS0, PS1, PS2, and PS3 | Best

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