Cisco WS-C6506 Software Manual page 679

Chapter 22 Administering the Switch
In a nonredundant configuration, the power that is available to the system is the combined power
capability of both power supplies. The system powers up as many modules as the combined capacity
allows. However, if one supply should fail and there is not enough power for all the previously powered
up modules, the system powers down some modules. These modules are marked as power-deny in the
show module Status field.
You can change the configuration of the power supplies to redundant or nonredundant at any time. If you
switch from a redundant to a nonredundant configuration, both power supplies are enabled (even a power
supply that was disabled because it was of a lower wattage than the other power supply). If you change
from a nonredundant to a redundant configuration, both power supplies are initially enabled, and if they
are of the same wattage, remain enabled. If they are of different wattage, a syslog message displays and
the lower wattage supply is disabled.
Table 22-1
Table 22-1
Configuration Change
Redundant to
nonredundant
Nonredundant to
redundant
Equal wattage power
supply is inserted with
redundancy enabled
Equal wattage power
supply is inserted with
redundancy disabled
Higher wattage power
supply is inserted with
redundancy enabled
Lower wattage power
supply is inserted with
redundancy enabled
OL-8978-04
describes how the system responds to changes in the power supply configuration.
Effects of Power Supply Configuration Changes
Effect
System log and syslog messages are generated.
•
The system power is increased to the combined power capability of
•
both supplies.
• The modules marked as power-deny in the show module Status field
are brought up if there is sufficient power.
System log and syslog messages are generated.
•
The system power is the power capability of the larger wattage
•
supply.
If there is not enough power for all previously powered-up modules,
•
some modules are powered down and marked as power-deny in the
show module Status field.
System log and syslog messages are generated.
•
• The system power equals the power capability of one supply.
• No change in the module status because the power capability is
unchanged.
System log and syslog messages are generated.
•
The system power is the combined power capability of both supplies.
•
• The modules marked as power-deny in the show module Status field
are brought up if there is sufficient power.
System log and syslog messages are generated.
•
The system disables the lower wattage power supply; the higher
•
wattage supply powers the system.
System log and syslog messages are generated.
•
The system disables the lower wattage power supply; the higher
•
wattage supply powers the system.
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
Power Management
22-13