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Chapter 9
Managing System Hardware
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m .
Table 9-1
Scenario
1
2
3
1. W = Watts
Table 9-2
Scenario
1
2
3
1. W = Watts
2.
OL-6973-03, Cisco MDS SAN-OS Release 2.x
Scenario 3: If 3000 W is added as power supply 2, then the current capacity value remains at
2500 W.
Reason: 2500 W is the lesser of the two power supplies.
Redundant Mode Power Supply Scenarios
Power
Current
Supply 1
Usage
1
(W)
(W)
2500
2000
2500
2000
2500
2000
Combined mode—the total power is twice the lesser of the two power supply capacities.
b.
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 differ as specified (see
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).
Combined Mode Power Supply Scenarios
Power
Current
Supply 1
Usage
1
(W)
(W)
2500
2000
2500
2000
2500
2000
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
Insertion of
New
Power
Capacity
Supply 2 (W)
(W)
1800
2500
2200
2200
3300
2500
Insertion of
New
Power
Capacity
Supply 2 (W)
(W)
1800
3600
2200
4400
3300
5000
Table
9-3.
Cisco MDS 9000 Family Configuration Guide
Power Supply Configuration Modes
Action Taken by Switch
Power supply 2 is shut down.
Capacity becomes 2200 W.
Capacity remains the same.
Table
9-2):
Action Taken by Switch
Power is never shut down. The
new capacity is changed.
9-7
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