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
2-31
Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x
OL-9285-05
Chapter 2 Troubleshooting Installs, Upgrades, and Reboots
Troubleshooting Cisco SAN-OS Software System Reboots
Unrecoverable System Restarts
An unrecoverable system restart might occur in the following cases:
•
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.
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
“Troubleshooting Cisco SAN-OS Software System
Reboots” section on page 2-13
.
The
show system reset-reason
CLI command displays the following information:
•
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
Example 2-2
show system reason-reset Command Output
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)
