Redundant Hot-Plug Power Supplies - Compaq ProLiant 8000 Technology Brief

TC000603TB
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ECHNOLOGY RIEF
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Power
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Supplies
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Temperature Monitoring
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Circuitry
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Fan Control Logic
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System Fans
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Figure 8: Schematic diagram of fan control logic.
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Redundant Processor Power Modules
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. . Each processor in the ProLiant 8000 server has its own redundant PPM. An additional PPM is
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included in the server to power the system board. PPMs are also known as voltage regulator
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. . modules. The PPMs deliver the precise voltage required by the processors.
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Compaq PPMs are programmable and support all current and future versions of Xeon processors.
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Each PPM has redundant circuitry. If a failure occurs in one circuit of the module, the other circuit
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automatically takes over the task of regulating power to the processor.
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Redundant Hot-Plug Power Supplies

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The ProLiant 8000 server uses one of the newest Compaq technologies to reduce downtime:
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intelligent, redundant, hot-plug power supplies. The server ships standard with two dual-rated
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1150-watt/500-watt power supplies and supports three power supplies for an N+1 redundant
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configuration. The power supplies are connected to a separate power backplane in the server and
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. . include new handles for easier insertion and removal. If one of the power supplies fails, its internal
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fans will continue to operate and help cool the server.
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The power supply has an embedded microcontroller and an inter-integrated circuit bus that
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communicates the status back to the system health drivers.
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information to the IMD and to Compaq Insight Manager.
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For additional details about Compaq's intelligent power supplies, see the technology brief
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Intelligent Power Supply Technology, document number ECG016/0198.
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(cont.)
System Boards
Ambient Probe
Power Supplies
Processors
OS
- Hardware shutdown
• H ard
- Restart when cool
• R es
- Graceful OS shutdown
- System alert
- Restart when cool
• S pe - Speed up fans
• S y
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The health drivers then send status