Intel MPCMM0001 manual Control Modes for Fan Trays, CMM Control Mode, Fantray Control Mode

Fan Control and Monitoring

N:The number of the fan tray being addressed.

These values will take effect immediately after they are entered. That means that if fantrayN’s current temperature status is normal and the user sets the normallevel the current cooling level will change immediately.

There are the limits on the possible cooling level values for the temperature statuses. The major status and the critical status are both always set to the maximum cooling level and are not configurable. In addition the following rule is always enforced.

Minimum cooling level <= normallevel <= minorlevel <= majorlevel = criticallevel = maximum cooling level

16.6Control Modes for Fan Trays

There are three modes of control that a fantray may operate at: CMM, FanTray or Emergency Shutdown. The fantray can only run at one control mode at a time. The control mode that the fantray is running at is its current control mode. The user has the ability to change the current control mode of each fantray in the shelf.

16.6.1CMM Control Mode

The CMM Control Mode is the mode in which the CMM has complete control over the fantray’s current cooling level. The user has the ability to configure how the Cooling Manager manages each fantray by changing the values in the cooling table. In the CMM Control Mode the cooling manager uses the cooling table to determine which cooling level to use for the current temperature status. The user will be able to change to this mode with the following command:

cmmset –l fantrayN -d control –v cmm

Where:

N:The number of the fan tray being addressed.

16.6.2Fantray Control Mode

The ATCA Specification defines a mode called local control where the fantray determines its own cooling level. This control mode is optional. Not all fan trays will support local control.

To change to this local control mode, the control mode on the CMM is changed to “fantray control”.

While a fantray is in “fantray control” any changes the user makes to the cooling table will not take effect immediately. They will be saved and take effect if the fantray’s current mode becomes the CMM Control Mode.

The user may change to this mode with using the following command:

cmmset –l fantrayN -d control –v fantray

Note: The control mode can only be fantray mode if there are no temperature events in the chassis.

16.6.3Emergency Shutdown Control Mode

The Emergency Shutdown Control Mode causes the fantray to stop cooling the system. A fantray will stay in this mode until the user changes the current control mode to one of the other two

134MPCMM0001 Chassis Management Module Software Technical Product Specification