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
10-19
Cisco MDS 9000 Family CLI Configuration Guide
OL-16184-01, Cisco MDS SAN-OS Release 3.x
Chapter 10 Managing System Hardware
About Clock Modules
Figure 10-1
Cisco MDS 9513 Front Fan Module Numbering
The rear fan module (DS-13SLT-FAN-R) on the Cisco MDS 9513 Director has only two fans. If a fan in
the rear fan module fails, the State field in the
show environment fan
command output only displays
“failure” and not the failing fan number (see
Example 10-8
).
Example 10-8 Displays Cisco MDS 9513 Rear Fan Module Failure
switch#
show environment fan
------------------------------------------------------
Fan Model Hw Status
------------------------------------------------------
Chassis DS-13SLT-FAN-F 0.3 ok
Chassis DS-13SLT-FAN-R 0.3 failure
PS-1 -- -- ok
PS-2 -- -- ok
About Clock Modules
All switches in the Cisco MDS 9000 Family have two clock modules—Module A (primary) and Module
B (redundant). The clock modules are designed, tested, and qualified for mission-critical availability
with a mean time between failures (MTBF) of 3,660,316 hours. This translates to a potential failure
every 365 years. Additionally, Cisco MDS 9000 Family switches are designed to automatically switch
to the redundant clock module should the active clock module fail.
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