Cisco MDS-9124 Troubleshooting Guide - Page 79
Unrecoverable System Restarts
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Chapter 2 Troubleshooting Installs, Upgrades, and Reboots Troubleshooting Cisco SAN-OS Software System Reboots Send documentation comments to [email protected] 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) OL-9285-05 Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x 2-31