Unrecoverable System Restarts - Cisco 9134 - MDS Multilayer Fabric Switch Troubleshooting Manual

Chapter 2 Troubleshooting Installs, Upgrades, and Reboots
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

Unrecoverable System Restarts

An unrecoverable system restart might occur in the following cases:
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The effect of a process reset is determined by the policy configured for each process. Unrecoverable reset
may cause loss of functionality, restart of the active supervisor, a supervisor switchover, or restart of the
switch.
To respond to an unrecoverable reset, see the
Reboots" section on page
The show system reset-reason CLI command displays the following information:
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Example 2-2
switch# show system reset-reason module 5
----- reset reason for module 5 -----
1) At 224801 usecs after Fri Jan 21 16:36:40 2005
Reason: Reset Requested by CLI command reload
Service:
Version: 2.1(2)
2) At 922828 usecs after Fri Jan 21 16:02:48 2005
Reason: Reset Requested by CLI command reload
Service:
Version: 2.1(2)
3) At 318034 usecs after Fri Jan 21 14:03:36 2005
Reason: Reset Requested by CLI command reload
Service:
Version:2.1(2)
4) At 255842 usecs after Wed Jan 19 00:07:49 2005
Reason: Reset Requested by CLI command reload
Service:
Version: 2.1(2)
OL-9285-05
A critical process fails and is not restartable.
A process restarts more times than is allowed by the system configuration.
A process restarts more frequently than is allowed by the system configuration.
2-13.
In a Cisco MDS 9500 Series switch, the last four reset-reason codes for the supervisor module in
slot 5 and slot 6 are displayed. If either supervisor module is absent, the reset-reason codes for that
supervisor module are not displayed.
In a Cisco MDS 9200 Series switch, the last four reset-reason codes for the supervisor module in
slot 1 are displayed.
The show system reset-reason module number command displays the last four reset-reason codes
for a specific module in a given slot. If a module is absent, then the reset-reason codes for that
module are not displayed.
Find the overall history of when and why expected and unexpected reloads occur.
Timestamp of when the reset or reload occurred
Reason for the reset or reload of a module
The service that caused the reset or reload (not always available)
The software version that was running at the time of the reset or reload
show system reason-reset Command Output
Troubleshooting Cisco SAN-OS Software System Reboots
"Troubleshooting Cisco SAN-OS Software System
Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x
2-31