Cisco AP775A - Nexus Converged Network Switch 5010 User Manual

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18-6
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 18 Managing System Hardware
Power Supply Configuration Modes
b. Combined mode—The total power is twice the lesser of the two power supply capacities.
For example, suppose you have the following usage figures configured:
Power supply 1 = 2500 W
Additional Power supply 2 = not used
Current Usage = 2000 W
Current capacity = 2500 W
Then the following three scenarios will differ as specified (see Table 18-2):
Scenario 1: If 1800 W is added as power supply 2, then the capacity increases to 3600 W.
Reason: 3600 W is twice the minimum (1800 W).
Scenario 2: If 2200 W is added as power supply 2, then the current capacity increases to
4400 W.
Reason: 4400 W is twice the minimum (2200 W).
Scenario 3: If 3000 W is added as power supply 2, then the current capacity increases to
5000 W.
Reason: 5000 W is twice the minimum (2500 W).
2. When you change the configuration from combined to redundant mode and the system detects a
power supply that has a capacity lower than the current usage, the power supply is shut down. If both
power supplies have a lower capacity than the current system usage, the configuration is not allowed.
Several configuration scenarios are summarized in Table 18-3.
Scenario 1: You have the following usage figures configured:
Power supply 1 = 2500 W
Additional Power supply 2 = 1800 W
Current Usage = 2000 W
Current mode = combined mode (so current capacity is 3600 W)
You decide to change the switch to redundant mode. Then power supply 2 is shut down.
2 2500 2000 2200 2200 Capacity becomes 2200 W.
3 2500 2000 3300 2500 Capacity remains the same.
1. W = Watts
Table 18-1 Redundant Mode Power Supply Scenarios (continued)
Scenario
Power
Supply 1
(W)
1
Current
Usage
(W)
Insertion of
Power
Supply 2 (W)
New
Capacity
(W) Action Taken by Switch
Table 18-2 Combined Mode Power Supply Scenarios
Scenario
Power
Supply 1
(W)
1
1. W = Watts
Current
Usage
(W)
Insertion of
Power
Supply 2 (W)
New
Capacity
(W) Action Taken by Switch
1 2500 2000 1800 3600 Power is never shut down. The
new capacity is changed.
2 2500 2000 2200 4400
3 2500 2000 3300 5000

Cisco AP775A - Nexus Converged Network Switch 5010 Specifications

General

Brand	Cisco
Model	AP775A - Nexus Converged Network Switch 5010
Category	Switch
Language	English