QuickSpecs
T
ECHNOLOGY
B
RIEF
(cont.)
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TC000604TB
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Redundant Hot-Plug Power Supplies
The ProLiant 8500 server uses one of the newest Compaq technologies to reduce downtime:
intelligent, redundant, hot-plug power supplies. The server supports two dual-rated
1150-watt/500-watt power supplies with new handles for easier insertion and removal. Even if one
of these power supplies fails, its internal fans will continue to operate and help cool the server. A
single power supply running at 220 volts can support a fully loaded ProLiant 8500 server, but a
second power supply adds redundancy and fault tolerance.
The power supplies have an embedded microcontroller and an inter-integrated circuit bus that
communicates the status back to the system health drivers.
2
The health drivers then send status
information to the IMD and to Compaq Insight Manager.
The microcontroller performs the following functions:
• Self-test. The intelligent power supplies perform their own power-on self-test (POST) that
checks temperature, RAM integrity, ROM version, analog-to-digital conversion accuracy, and
nonvolatile memory integrity of the power supply.
• Auto Line Sensing. Because the power supplies are rated for both 1150 watts (at 220 volts)
and 500 watts (at 110 volts), a line-sensing feature automatically recognizes which line voltage
is connected. The customer does not need to configure the supply for voltage.
• LED Standby Controls. The microcontroller also drives two status light-emitting diodes
(LEDs) on the back of the power supply that indicate power status, as shown in Figure 9. This
gives the user vital status information at a glance.
Clear - Front panel power switch off or open interlock
Flashing Green - Power on delay or software power off
Green - Outputs on and good
Flashing Amber - Failed self test
Amber - Outputs failed
Flashing Amber/Green - Restart failed
Green - AC power good
Clear - AC power not good
Figure 9: Power supply LED status indicators.
2
For additional details about Compaq’s intelligent power supplies, see the technology brief
Intelligent Power Supply Technology, document number ECG016/0198.