About Clock Modules - Cisco AP776A - Nexus Converged Network Switch 5020 Configuration Manual

Chapter 11 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
Figure 11-1
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 11-8 Displays Cisco MDS 9513 Rear Fan Module Failure
switch# show environment fan
------------------------------------------------------
Fan
------------------------------------------------------
Chassis
Chassis
PS-1
PS-2

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.
OL-18084-01, Cisco MDS NX-OS Release 4.x
Cisco MDS 9513 Front Fan Module Numbering
3
2
1
6
5
4
9
8
7
12
11
10 15
14
13
Model
DS-13SLT-FAN-F
DS-13SLT-FAN-R
--
--
Example 11-8).
Hw Status
0.3 ok
0.3 failure
-- ok
-- ok
Cisco MDS 9000 Family CLI Configuration Guide
About Clock Modules
11-19