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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)
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