High-Altitude Mode Oracle Ilom Feature - Sun Oracle Netra SPARC T4-1B Product Notes

Note – You might need to label new and replacement drives using the format
utility before you can install the OS on the drives.
High-Altitude Mode Oracle ILOM
Feature
The SPARC T4-series CPUs are the first SPARC CPUs to ship with an automatic CPU
throttling feature. If an Oracle ILOM alert shows that temperature is too high, a T4
CPU will reduce speed until the system cools.
Netra systems use a different thermal control mechanism than the non-Netra
products. The NEBS system maintains temperatures at 27ºC to keep acoustic levels
within NEBS guidelines.
If you want to maintain optimal CPU performance and increase fan speed to cool the
Netra system you must use the high-altitude settings in CMM Oracle ILOM firmware
4.1.1 (or newer).
If your server modules operate with sustained high CPU work loads at altitudes
above 900m elevation, the system might "throttle" or slow down the server module
CPUs to continue to meet the 27ºC threshold and the acoustic limits.
The High-Altitude mode allows you to override the CPU throttling feature. However,
if you use the High-Altitude mode, the CPUs will run hotter, and the fans will
automatically speed up to reduce heat. The fan noise will exceed NEBS specifications.
See the Sun Netra 6000 Modular System Product Notes for information about using the
High-Altitude Mode.
http://www.oracle.com/pls/topic/lookup?ctx=Netra6000
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