10-3
Cisco MDS 9000 Fabric Manager Switch Configuration Guide
OL-7753-01
Chapter 10 Managing System Hardware
Configuring Power Supplies
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).
Table 10-2
lists combined mode power supply scenarios.
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
Table 10-3
.
•
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).
Table 10-2
Combined 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
3600
Power is never
shut down. The
new capacity is
changed.
2
2500
2000
2200
4400
3
2500
2000
3300
5000
Содержание DS-C9216I-K9
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