HP Server rp7420 HP 9000 rp7420 Server - User Service Guide, Fifth Edition - Page 81

Power Control, Server Management Commands

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NOTE: Fans driven to a high RPM in dense air cannot maintain expected RPM and will be considered bad by the MP leading to a "False Fan Failure" condition. Power Control If active, the manageability firmware is responsible for monitoring the power switch on the front panel. Setting this switch to the ON position is a signal to the MP to turn on 48 V DC power to the server. The PE command can also be used to send this signal. This signal does not always generate a transition to the powered state. The following conditions prevent the manageability firmware from applying 48 V DC power to the server: • Insufficient number of active bulk power supplies • Insufficient number of I/O fans • Insufficient number of main fans • Ambient temperature is in an OVERTEMP HIGH condition Unless one of the following conditions occurs, 48 V DC power to the server is maintained: • A main fan failure causes there to be an insufficient number of main fans. • A I/O fan failure causes there to be an insufficient number of I/O fans. • Ambient temperature reaches an OVERTEMP HIGH condition. • The front panel power switch is turned OFF. • The PE command is issued to the manageability firmware to turn off power to the server cabinet. Server Management Commands For a list of the server management commands, go to the iLO 2 Operations Guide at http:// docs.hp.com. Server Management Commands 81

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NOTE:
Fans driven to a high RPM in dense air cannot maintain expected RPM and will be
considered bad by the MP leading to a “False Fan Failure” condition.
Power Control
If active, the manageability firmware is responsible for monitoring the power switch on the front
panel. Setting this switch to the ON position is a signal to the MP to turn on 48 V DC power to
the server. The
PE
command can also be used to send this signal. This signal does not always
generate a transition to the powered state. The following conditions prevent the manageability
firmware from applying 48 V DC power to the server:
•
Insufficient number of active bulk power supplies
•
Insufficient number of I/O fans
•
Insufficient number of main fans
•
Ambient temperature is in an OVERTEMP HIGH condition
Unless one of the following conditions occurs, 48 V DC power to the server is maintained:
•
A main fan failure causes there to be an insufficient number of main fans.
•
A I/O fan failure causes there to be an insufficient number of I/O fans.
•
Ambient temperature reaches an OVERTEMP HIGH condition.
•
The front panel power switch is turned OFF.
•
The
PE
command is issued to the manageability firmware to turn off power to the server
cabinet.
Server Management Commands
For a list of the server management commands, go to the
iLO 2 Operations Guide
at
http://
docs.hp.com
.
Server Management Commands
81