Filter
Top Products
If a fan unit stops or the temperature in any of the three cooling zones rises
above 60 C, the Controller module may, depending on a user configurable
parameter (Overheat_Auto_Power_Down) use the SCI bus to power down some
of the 8260 modules in the affected cooling zone in order to bring down the
temperature to an acceptable level.
The setting of the Overheat_Auto_Power_Down parameter is controlled by the
following DMM command:
SET OVERHEAT_AUTO_POWER_DOWN {enable|disable}
If you set this parameter to
enable
, the controller module will automatically
power down some of the 8260 modules in the affected cooling zone in response
to an overheat condition. If this parameter is disabled, the controller module will
not power down any modules if the temperature rises above 60 in any of the
cooling zones.
Note: Disabling the Overheat_Auto_Power_Down may result in damage to the
8260.
You can display the setting of the Overheat_Auto_Power_Down parameter using
the following DMM command:
SHOW POWER MODE
An example of the output from this command is shown in Figure 62.
8260> show power mode
Power Management Information
----------------------------
Hub Power Modes:
Fault-Tolerant Mode: NON_FAULT_TOLERANT
Fault-Tolerant Status: NON_FAULT_TOLERANT
Overheat Power Down Mode: ENABLE
8260>
Figure 62. Output from Show Power Mode Command
The following section describes the mechanics of the intelligent cooling
subsystem:
•
Each of the 8260 modules can be assigned a power class. By default, the
8260 modules are shipped from the factory with a power class setting of 3.
•
8250 modules cannot be assigned a power class. By default, they are
effectively assigned a power class of 10.
•
If an overheat condition is detected there is a one-minute delay and then the
DMM is notified.
•
DMM will generate an SNMP alert as a result of receiving an over
temperature notification. This alert will be displayed on the local console
attached to the DMM. The alert is also sent to any SNMP manager which is
defined in the community table of the DMM as a
trap receiver
.
•
If the Over_Heat Power_Down is set to Enable, (default is Disable) then the
power subsystem is used to power down 8260 modules according to their
Chapter 6. 8260 Intelligent Cooling Subsystem 93