Power Supply Configuration Guidelines - HP Cisco MDS 9020 - Fabric Switch Configuration Manual

Chapter 10 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
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The chassis in the Cisco MDS 9000 Family uses 1200 W when powered at 110 V, and 2500 W when
Note
powered at 220 V.
To configure the power supply mode, follow these steps:
Command
Step 1
switch# config t
Step 2
switch(config)# power redundancy-mode combined
switch(config)#
switch(config)# power redundancy-mode redundant
switch(config)#
See the Use the show environment power command to view the current power supply configuration.
Note

Power Supply Configuration Guidelines

Follow these guidelines when configuring power supplies:
1.
OL-16184-01, Cisco MDS SAN-OS Release 3.x
Combined mode—Uses the combined capacity of both power supplies. In case of power supply
failure, the entire switch can be shut down (depends on the power used) causing traffic disruption.
This mode is seldom used, except in cases where the switch has two low power supply capacities
but a higher power usage.
When power supplies with different capacities are installed in the switch, the total power available
differs based on the configured mode, either redundant or combined:
Redundant mode—the total power is the lesser of the two power supply capacities.
a.
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 power supply 2 is shut down.
Reason: 1800 W is less than the usage of 2000 W.
Scenario 2: If 2200 W is added as power supply 2, then the current capacity decreases to 2200
W.
Reason: 2200 W is the lesser of the two power supplies.
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.
Power Supply Configuration Modes
Purpose
Enters configuration mode.
Configures combined power supply mode.
Reverts to the redundant (default) power
supply mode.
Table 10-1):
Cisco MDS 9000 Family CLI Configuration Guide
10-11