Cisco 6509 Installation Guide - Page 268
If you have two, power supplies of, and redundancy is, Configuration Change, Effect
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Power Supply Redundancy Appendix A Power Supply Specifications Table A-21 Power Supply Redundancy If you have two power supplies of Equal wattage and redundancy is Enabled Unequal wattage Enabled Equal or unequal wattage Disabled Then The total power drawn from both supplies is never greater than the capability of one supply. If one supply malfunctions, the other supply can take over the entire system load. Each power supply provides approximately half of the required power to the system. Load sharing and redundancy are enabled automatically; no software configuration is required. Both power supplies initially come online. For the Catalyst operating system, if the difference between the two power supply's output wattage is less than 10% of the higher output wattage power supply, redundancy is enabled. If the difference is greater than 10%, the lesser wattage power supply is disabled. For Cisco IOS, both power supplies come on. The total available wattage is the output wattage of the higher wattage power supply. The total power available to the system is approximately 167 percent of the lower-wattage power supply. The system powers up as many modules as the combined capacity allows. If the higher-wattage power supply fails, the lower-wattage supply might also shut down due to overcurrent protection to prevent damage to the lower-wattage power supply. Table A-22 Effects of Power Supply Configuration Changes Configuration Change Redundant to nonredundant Nonredundant to redundant Equal wattage power supply is inserted with redundancy enabled Effect • System log and syslog messages are generated. • System power is increased to approximately 167 percent of the lower-wattage power supply. • The modules marked as power-deny in the show module Status field are powered up if there is sufficient power. • System log and syslog messages are generated. • System power is the power capability of the higher-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. • System power equals the power capability of one supply. (Both supplies provide approximately one half of the total current.) • No change in the module status because the power capability is unchanged. A-58 Catalyst 6500 Series Switches Installation Guide OL-5781-04
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