Saved Power Management Configurations
The active controller module stores:
Saved power management configuration data for all installed modules in on-board NVRAM
Unmanaged power allocation data describing the type (per voltage) and the amount of power (Watts)
available to installed modules.
When the 8265 powers up following a reset:
The controller module uses saved power management configuration data to verify that power
configurations for installed modules precisely match those in effect prior to the reset.
If necessary, the controller module uses the saved data to restore lost module power configurations.
The controller module saves the power management configuration data shown in Table 4.
Table 4. Saved Power Management Configuration Data
Data Type
Description
Unmanaged power
allocation
Power available to modules after all installed modules have powered up.
Slot profile
Identifies the module installed in a given slot as a CPWS module or a media module.
In addition, empty slots are identified.
Slot power state
Power state for each installed module (enabled, disabled, or pending).
Slot power class
Power class setting for each installed module.
Power mode
Power mode for the switch prior to a switch reset (power fault-tolerant mode or power
non-fault-tolerant mode).
As the switch powers up following a reset, the controller module compares the saved slot profile data with
current slot profile data, in each successive slot.
If the saved slot profile data for all slots matches the current slot profile data, all modules then
configure to saved power management configuration data.
If a current slot profile does not match the saved profile for a given slot, the following applies:
– Modules power up based on power class setting and relative slot location.
See above, "8265 Module Power Class Settings" for more information.
If a current slot profile does not match the saved profile for a given slot, the following applies:
– The controller module powers up modules based on power class setting and relative slot location
to the limit of the current power budget.
Note: If a power supply fails while the switch is rebooting, saved power management configuration data
(for example, the number of installed and functioning power supplies) does not accurately describe
switch conditions following the reboot. Under these circumstances, total power required by
modules may be more power than the power available after the reboot.
Chapter 10. Managing the Intelligent Cooling Subsystem
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