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4-12
Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x
OL-9285-05
Chapter 4 Troubleshooting Hardware
Troubleshooting Clock Module Issues
If Cisco SAN-OS detects a major temperature threshold violation on a redundant supervisor intake
sensor, it immediately shuts down the redundant supervisor. This will result in either a switchover or in
the standby supervisor module shutting down, depending which supervisor module violated the
threshold.
If Cisco SAN-OS detects a major temperature threshold violation on an intake sensor on the only
operational supervisor in a switch, a 120 second countdown starts. If the temperature recovers, the
countdown is discarded. Otherwise, the switch power supplies are shutdown. The following syslog
messages are printed every five seconds during the countdown
Error Message PLATFORM-0-SYS_RESET: [chars] System shutdown in [dec] seconds.
Explanation
System shutdown in the number of seconds shown in the error message.
Recommended Action Enter show environment temperature CLI command or similar Fabric
Manager/Device Manager command to collect more information.
Sometimes, a temperature sensors fails. No explicit action is taken for this condition except generating
the following system message:
Error Message PLATFORM-5-MOD_TEMPFAIL: Module [dec] temperature sensor failed.
Explanation
Module contains a faulty temperature sensor.
Recommended Action Enter the show environment temperature CLI command or similar Fabric
Manager/Device Manager command to collect more information.
Troubleshooting Clock Module Issues
A Cisco MDS 9500 Series director has two clock modules: A and B. Use the show environment clock
CLI command to view the clock module status. (See Example 4-4.)
Example 4-4 Output of show environment clock Command
switch# show environment clock
----------------------------------------------------------
Clock Model Hw Status
----------------------------------------------------------
A DS-C9500-CL 0.0 ok/active
B DS-C9500-CL 0.0 ok/standby
On a clock module failure, the system switches over to the redundant clock module automatically. This
also results in a hardware reset of the switch. When the switch reboots, it displays the current active
clock module. The following syslog message is printed at switch boot-up time, indicating the current
active clock module:
Error Message PLATFORM-0-CHASSIS_CLKSWRESET: Switch reset due to clock switch.
Explanation
Chassis clock source has failed and system will be reset. System will automatically start
using the redundant clock module.
Recommended Action Replace the failed clock module during the next maintenance window.
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