Installation Manual

Fan details
The following details are displayed for each fan:
• Fan—The fan name.
• Location—For nonblade servers, the location in the server chassis is listed. For server
blades, the virtual fan is listed with the location Virtual.
• Status—The fan health status.
For more information, see “Subsystem and device status values” (page 154).
• Speed—The fan speed (percent).
Fans
The iLO firmware, in conjunction with the hardware, controls the operation and speed of the fans.
Fans provide essential cooling of components to ensure reliability and continued operation. The
fans react to the temperatures monitored throughout the system to provide sufficient cooling with
minimal noise.
Monitoring the fan subsystem includes the sufficient, redundant, and nonredundant fan
configurations. If one or more fans fail, the server still provides sufficient cooling to continue
operation.
Fan operation policies might differ from server to server based on fan configuration and cooling
demands. Fan control monitors the internal temperature of the system, increasing the fan speed
to provide more cooling, and decreasing the fan speed when cooling is sufficient. If a fan failure
occurs, fan operation policies might increase the speed of the other fans, record the event in the
IML, or turn on LED indicators.
In nonredundant configurations, or redundant configurations where multiple fan failures occur,
the system might be incapable of providing sufficient cooling to protect the server from damage
and to ensure data integrity. In this case, in addition to the cooling policies, the system might
start a graceful shutdown of the operating system and server.
Server blades use the enclosure fans to provide cooling because they do not have internal fans.
The enclosure fans are called virtual fans on the Fans tab. The Virtual fan reading represents
the cooling amount that a server blade is requesting from the enclosure. The server blade
calculates the amount of required cooling by examining various temperature sensors and
calculating an appropriate fan speed. The enclosure uses information from all of the installed
server and nonserver blades to adjust the fans to provide the appropriate enclosure cooling.
Temperature information
The Temperature Information page includes a temperature graph and a table that displays the
location, status, temperature, and threshold settings of temperature sensors in the server chassis.
If the server is powered off, the system health information on this page is current as of the last
power off. Health information is updated only when the server is powered on and POST is
complete.
Viewing the temperature graph
1. Navigate to the Information→System Information page, and then click the Temperatures
tab.
Temperature information 155