10-2
Cisco MDS 9000 Fabric Manager Switch Configuration Guide
OL-7753-01
Chapter 10 Managing System Hardware
Configuring Power Supplies
•
In redundant mode, the total power is the lesser of the two power supply capacities. For example, if
you have the following usage figures configured:
Power supply 1 = 2500 Watts
Additional Power supply 2 = not used
Current usage = 2000 Watts
Current capacity = 2500 Watts
Then the following three scenarios differ as specified:
–
Scenario 1
—If 1800 Watts is added as power supply 2, then power supply 2 is shut down.
Reason: 1800 Watts is less than the usage of 2000 Watts.
–
Scenario 2
—If 2200 Watts is added as power supply 2, then the current capacity decreases to
2200 Watts.
Reason: 2200 Watts is the lesser of the two power supplies.
–
Scenario 3
—If 3000 Watts is added as power supply 2, then the current capacity value remains
at 2500 Watts.
Reason: 2500 Watts is the lesser of the two power supplies.
Table 10-1
lists redundant mode power supply scenarios.
•
In combined mode, the total power is twice the lesser of the two power supply capacities.
For example, if you have the following usage figures configured:
Power supply 1 = 2500 Watts
Additional Power supply 2 = not used
Current Usage = 2000 Watts
Current capacity = 2500 Watts
Then, the following three scenarios differ as specified:
–
Scenario 1
—If 1800 Watts is added as power supply 2, then the capacity increases to 3600
Watts.
Reason: 3600 Watts is twice the minimum (1800 Watts).
–
Scenario 2
—If 2200 Watts is added as power supply 2, then the current capacity increases to
4400 Watts.
Table 10-1
Redundant Mode Power Supply Scenarios
Scenario
Power Supply 1
(Watts)
Current Usage
(Watts)
Insertion of
Power Supply 2
(Watts)
New Capacity
(Watts)
Action Taken
by Switch
1
2500
2000
1800
2500
Power supply 2
is shut down.
2
2500
2000
2200
2200
Capacity
becomes
2200Watts.
3
2500
2000
3300
2500
Capacity
remains the
same.
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