Auto Save on Crash or RolloverException information for master or standby units is stored in the flash:/TRACE_LOG_DIR directory. Thisdirectory contains files that save trace information when there has been a task crash or timeout.On a master unit, you can reach the TRACE_LOG_DIR files by FTP or by using the show file commandfrom the flash://TRACE_LOG_DIR directory.NOTE: Non-management member units do not support this functionality.Last Restart ReasonIf a Z9000 system restarted for some reason (automatically or manually), the show system commandoutput includes the reason for the restart.The following table shows the reasons displayed in the output and their corresponding causes.Line Card Restart Causes and ReasonsCauses Displayed ReasonsRemote power cycle of the chassis push-button resetreload soft resetreboot after a crash soft resetHardware Watchdog TimerThe hardware watchdog command automatically reboots an Dell Networking OS switch/router when aunit is unresponsive.This is a last resort mechanism intended to prevent a manual power cycle.show hardware CommandsThese commands display information from a hardware subcomponent and from hardware-based featuretables.NOTE: Use the show hardware commands only under the guidance of the Dell NetworkingTechnical Assistance Center (TAC).• View internal interface status of the stack-unit CPU port which connects to the external managementinterface.show hardware stack-unit {0-11} cpu management statistics• View driver-level statistics for the data-plane port on the CPU for the specified stack-unit.show hardware stack-unit {0-11} cpu data-plane statisticsIt provides insight into the packet types entering the CPU to see whether CPU-bound traffic is internal(IPC traffic) or network control traffic, which the CPU must process.• View the modular packet buffers details per stack unit and the mode of allocation.show hardware stack-unit {0-11} buffer total-buffer• View the modular packet buffers details per unit and the mode of allocation.940 Z-Series Debugging and Diagnostics
