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
10-13
Cisco MDS 9000 Family CLI Configuration Guide
OL-16184-01, Cisco MDS SAN-OS Release 3.x
Chapter 10 Managing System Hardware
About Crossbar Management
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).
About Crossbar Management
Cisco MDS SAN-OS Release 3.0(1) and later supports two types of hardware for the Cisco MDS 9500
Series Directors: Generation 1 and Generation 2.
Generation 1
consists of all hardware supported by Cisco SAN-OS prior to Release 3.0(1), including the
following:
•
Cisco MDS 9506 and 9509 Director chassis
•
Supervisor-1 module
Table 10-3
Combined Mode Power Supply Scenarios
Scenario
Power
Supply 1 (W)
1
1.
W = Watts
Current
Mode
Current
Usage (W)
Power
Supply 2 (W) New Mode
New
Capacity (W) Action Taken by Switch
1
2500
combined
2000
1800
N/A
3600
This is the existing
configuration.
2500
N/A
2000
1800
redundant
2500
Power supply 2 is shut down
2
2500
combined
2000
2200
N/A
4400
This is the existing
configuration.
2500
N/A
2000
2200
redundant
2200
The new capacity is changed.
3
2500
combined
3000
1800
N/A
3600
This is the existing
configuration.
2500
N/A
3000
1800
redundant
N/A
Rejected, so the mode reverts
to combined mode.