Installation Manual

Temperature sensor details
• Sensor—The ID of the temperature sensor, which also gives an indication of the sensor
location.
• Location—The area where the temperature is being measured.
In this column, Memory refers to the following:
◦ Temperature sensors located on physical memory DIMMs.
◦ Temperature sensors located close to the memory DIMMs, but not located on the DIMMs.
These sensors are located further down the airflow cooling path, near the DIMMs, to
provide additional temperature information.
The ID of the temperature sensor in the Sensor column helps to pinpoint the location,
providing detailed information about the DIMM or memory area.
• X—The x-coordinate of the temperature sensor.
• Y—The y-coordinate of the temperature sensor.
• Status—The temperature status.
• Reading—The temperature recorded by the temperature sensor. If a temperature sensor
is not installed, the Reading column shows the value N/A.
• Thresholds—The temperature thresholds for the warning for overheating conditions. The
two threshold values are Caution and Critical. If a temperature sensor is not installed, the
Thresholds column shows the value N/A.
Temperature monitoring
The following temperature thresholds are monitored:
• Caution—The server is designed to maintain a temperature below the caution threshold.
If the temperature exceeds the caution threshold, the fan speeds are increased to maximum.
If the temperature exceeds the caution threshold for 60 seconds, a graceful server shutdown
is attempted.
• Critical—If temperatures are uncontrollable or rise quickly, the critical temperature threshold
prevents system failure by physically shutting down the server before the high temperature
causes an electronic component failure.
Monitoring policies differ depending on the server requirements. Policies usually include increasing
fan speeds to maximum cooling, logging temperature events in the IML, providing a visual
indication of events by using LED indicators, and starting a graceful shutdown of the operating
system to avoid data corruption.
Temperature information 157