Cisco DS-X9530-SF1-K9 - Supervisor-1 Module - Control Processor Configuration Manual page 236

Power Supply Configuration Modes
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 9-3 Combined Mode Power Supply Scenarios
Power
1
Scenario Supply 1 (W)
1 2500
2500
2 2500
2500
3 2500
2500
1. W = Watts
Cisco MDS 9000 Family Configuration Guide
9-8
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.
Reason: 1800 W 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 W
Additional Power supply 2 = 2200 W
Current Usage = 2000 W
Current mode = combined mode (so current capacity is 4400 W).
You decide to change the switch to redundant mode. Then the current capacity decreases to 2200
W.
Reason: 2200 W is the lesser of the two power supplies.
Scenario 3: You have the following usage figures configured:
Power supply 1 = 2500 W
Additional Power supply 2 = 1800 W
Current Usage = 3000 W
Current mode = combined mode (so current capacity is 3600 W).
You decide to change the switch to redundant mode. Then the current capacity decreases to 2500
W and the configuration is rejected.
Reason: 2500 W is less than the system usage (3000 W).
Current Current
Mode Usage (W)
combined 2000
N/A 2000
combined 2000
N/A 2000
combined 3000
N/A 3000
Power
Supply 2 (W) New Mode
1800 N/A
1800 redundant
2200 N/A
2200 redundant
1800 N/A
1800 redundant
Chapter 9 Managing System Hardware
New
Capacity (W) Action Taken by Switch
3600 This is the existing
configuration.
2500 Power supply 2 is shut down
4400 This is the existing
configuration.
2200 The new capacity is changed.
3600 This is the existing
configuration.
N/A Rejected, so the mode reverts
to combined mode.
OL-6973-03, Cisco MDS SAN-OS Release 2.x