Guidelines For Power Supplies With Different Capacities - Cisco DS-C9216I-K9 Configuration Manual

Chapter 10 Managing System Hardware
Table 10-2
Table 10-2
Scenario
1
2
3

Guidelines for Power Supplies with Different Capacities

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. Various
configuration scenarios are displayed and summarized in
•
•
•
OL-7753-01
Reason: 4400 Watts is twice the minimum (2200 Watts).
Scenario 3—If 3000 Watts is added as power supply 2, then the current capacity increases to
–
5000 Watts.
Reason: 5000 Watts is twice the minimum (2500 Watts).
lists combined mode power supply scenarios.
Combined Mode Power Supply Scenarios
Power Supply 1
(Watts)
2500
2500
2500
Scenario 1—You have the following usage figures configured:
Power supply 1 = 2500 Watts
Additional Power supply 2 = 1800 Watts
Current Usage = 2000 Watts
Current mode = combined mode (so current capacity is 3600Watts)
You decide to change the switch to redundant mode. Then power supply 2 is shut down.
Reason: 1800Watts is the lesser of the two power supplies and it is less than the system usage.
Scenario 2—You have the following usage figures configured:
Power supply 1 = 2500 Watts
Additional Power supply 2 = 2200 Watts
Current Usage = 2000 Watts
Current mode = combined mode (so current capacity is 4400Watts).
You decide to change the switch to redundant mode. Then the current capacity decreases to
2200Watts.
Reason: 2200Watts is the lesser of the two power supplies.
Scenario 3—You have the following usage figures configured:
Power supply 1 = 2500 Watts
Additional Power supply 2 = 1800 Watts
Current Usage = 3000 Watts
Current mode = combined mode (so current capacity is 3600 Watts).
Insertion of
Current Usage Power Supply 2
(Watts) (Watts)
2000 1800
2000 2200
2000 3300
Table
Cisco MDS 9000 Fabric Manager Switch Configuration Guide
Configuring Power Supplies
New Capacity Action Taken
(Watts) by Switch
3600 Power is never
shut down. The
4400
new capacity is
5000
changed.
10-3.
10-3