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138 MPCMM0001 Chassis Management Module Software Technical Product Specification
Fan Control and Monitoring
16.11.2 Structure of /etc/cmm/fantray.cfg
All default values will persist in the /etc/cmm/fantray.cfg file. These will be stored in key=value
pairings. These are the formats of those entries in the /etc/cmm/fantray.cfg file.
Example 2. Sample /etc/cmm/fantray.cfg file
0157.870.minorlevel=76
0157.870.normallevel=72
0157.870.control=fantray
16.11.3 Code Defaults
The code defaults are determined using a simple algorithm and values gathered by issuing the Get
Fan Speed Properties command to the fan tray. Using the returned Maximum Speed Level,
Minimum Speed Level and Normal Operating Level the Cooling Manager makes the following
assignments. The code defaults are determined as follows:
— Normallevel = Normal Operating Level
— Criticallevel, majorlevel = Maximum Speed Level
— Minorlevel = [(Maximum Speed Level – Normal Operating Level) / 2] + Minimum Speed
Level
If there aren’t any user or vendor specified defaults configured then the Cooling Manager will put
all fantrays into CMM Control Mode and it will use this algorithm to populate the cooling table.
16.11.4 Restoring Defaults
Aside from using defaults during fantray insertion defaults can be used by the user to reset the
cooling table. The user can use the command.
cmmset –l fantrayN -d restoredefaults –v true
N: The number of the fan tray being addressed.
This command will use the vendor defaults if possible, or the code default if not, to reset the
cooling table. In addition to restoring the cooling table, all saved user defaults will be cleared.
The same command will reset the control mode. If there is a specified vendor control mode it will
be used, if not the CMM Control Mode will be used to set the current control mode. The user
specified default control mode will also be cleared.
16.12 Firmware Upgrade/Downgrade
When a fan tray’s firmware is upgraded or downgraded the user who is changing the firmware
should update the vendor defaults in the /etc/cmm/fantray.cfg file on both CMMs and then
upgrade/downgrade the firmware. When the firmware is upgraded/downgraded the fan tray will go
through its M-states and when it returns to the M4 state the Cooling Manager will re-read the /etc/
cmm/fantray.cfg file and determine the values to be used in the cooling table. If the new firmware
on the fan tray has a different minimum cooling level or a different maximum cooling level the
Cooling Manager can no longer trust the user defaults in the /etc/cmm/fantray.cfg file.
The Cooling Manager keeps track of a fan tray’s properties in the /etc/cmm/fantray.cfg file so that