Artesyn System Management Interface Based on HPI-B (Centellis 2000 R3.0/4411) User's Guide (June 2014) - Manual (Page 78)

Using HPI-B
System Management Interface Based on HPI-B (Centellis 2000 R3.0/4411) User’s Guide (6806800P20C) 78
If more than one sensor has reached the temperature warning level and therefore several PIDs
are active at the same time, the software combines the several outputs of the PIDs into one
output which is used to control the fans.
Configuration option: The configuration parameter
Cooling_DeactOnUpperNonRecoverTemp
forces to power off all blades and drop fan
speed after receiving nonrecoverable thermal events from two different resources. This option
is available on C2000 R3.0 chassis only.
If individual fans fail, the software compensates this by increasing the fan speed of the
remaining fans accordingly.
Sensors located on FRUs which have been extracted are no longer considered for the cooling
management. Furthermore, if a sensor is temporarily not accessible, the software freezes its
last state and resumes the sensor control based on the frozen data as soon as the connection
has been reestablished.
4.6.1.2 Configuring the Cooling Management
The behavior of the cooling management can be configured via entries in the configuration file
/etc/bbs-hpib/bbs-hpib.conf
. All entries which are related to the cooling
management start with the prefix Cooling_.
The cooling system can be influenced by the parameters listed in the Table 4-42 .
Whenever one or more temperature sensors have reached the upper non-recoverable level,
the fan speed is always set to the maximum, i.e. 100%.
Whenever one or more sensors have reached the upper critical level, the software increases
the fan speed by a certain percentage, calculated by an internal algorithm. This can typically
be observed as a sudden increase of the fan noise.