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Chapter 9
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 .
Use the show environment fan command to display the fan module status (see
Example 9-5
switch# show environment fan
------------------------------------------------------
FAN
------------------------------------------------------
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.
We recommend that the failed clock module be replaced during a maintenance window.
Tip
Use the show environment clock command to display the status for both clock modules (see
Example
Example 9-6
switch# show environment clock
----------------------------------------------------------
Clock
----------------------------------------------------------
A
B
Displaying Environment Information
Use the show environment command to display all environment-related switch information.
Example 9-7
switch# show environment
Clock:
----------------------------------------------------------
Clock
----------------------------------------------------------
A
B
Fan:
------------------------------------------------------
FAN
------------------------------------------------------
Chassis
OL-6973-03, Cisco MDS SAN-OS Release 2.x
Displays Chassis Fan Information
Model
WS-9SLOT-FAN
--
--
9-6).
Displays Chassis Clock Information
Model
DS-C9500-CL
DS-C9500-CL
Displays All Environment Information
Model
Clock Module
Clock Module
Model
DS-2SLOT-FAN
Hw
Status
0.0
ok
--
ok
--
ok
Hw
Status
0.0
ok/active
0.0
ok/standby
Hw
Status
1.0
ok/active
1.0
ok/standby
Hw
Status
0.0
ok
Cisco MDS 9000 Family Configuration Guide
About Clock Modules
Example
9-5).
9-11
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