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5.4.4 Installing 8250 Module in a Hub Not Managed by DMM
When a new 8250 module is inserted in a hub which is not managed by DMM,
the process of applying power to the newly installed module is the same as what
was described above. However, since there is no DMM, the Controller module is
unable to acquire the power requirements of the 8250 module and to update its
power budget table. Therefore, installing 8250 modules will result in the
Controller module having an inaccurate power budget table which will render the
power management of the controller module ineffective. Therefore, you are
strongly recommended to ensure that a DMM is installed in the 8260 hub before
you attempt to install 8250 modules in the 8260.
The process of applying power to a newly installed 8250 module in an 8260 not
managed by DMM is shown in Figure 54.
Figure 54. Installing 8250 Modules in an 8260 Not Managed by DMM
5.5 Controlling Power to the 8260 Modules
You can use the following DMM command to enable/disable power to selected
slots in your 8260.
SET POWER SLOT {slot} MODE {enable|disable}
Note that this command is only applicable if an 8260 module is installed in the
selected slot. This command does not have any effect on the availability of
power to the 8250 modules installed in the selected slot.
Also, note that this command is issued against the slot; therefore, it is not stored
in the NVRAM of the 8260 modules installed in that slot.
5.6 Power Management Considerations
•
In case of a power failure, the controller might bring down 8260 modules or
reset the hub depending on the available power budget and types of
modules installed in the 8260.
Chapter 5. 8260 Intelligent Power Management Subsystem 85