Troubleshooting Guide

Example
VSP-4850GTS-PWR+:1#show pluggable-optical-modules config
================================================================================
Pluggable Optical Module Global Configuration
================================================================================
ddm-monitor : disabled
ddm-monitor-interval : 5
ddm-traps-send : enabled
ddm-alarm-portdown : disabled
Flight Recorder
The Flight Recorder is a high level term for the framework in place on Virtual Services Platform 4000
to store both history and current state information for various kernel, system, and application data
with minimal overhead to execution. This data can later be accessed on-demand when debugging
systems issues to give engineers the best possible troubleshooting information. Functionally, the
Flight Recorder consists of two elements; Persistent Memory and Always-on Trace.
The Persistent Memory feature stores information in volatile memory outside of any process. This
feature provides information on crashes, errors, and outages that are not the result of a power
failure. Persistent Memory data not saved to non-volatile storage before a power failure will be lost.
Persistent Memory snapshots are taken when:
• a critical process stops functioning
• a process stops responding
• the hardware watchdog activates
• the user initiates a snapshot in the ACLI
The Always-on Trace feature creates an ongoing, circular log of every trace call recently executed
regardless of the trace level enabled by the user. The Always-On Trace feature uses circular
logging, and therefore stores the most recent traces of the process.
Flight Recorder functionality is provided only through ACLI. The following commands are used to
make use of this feature:
•
flight-recorder snapshot 1
This command takes a snapshot of all flight-recorder files, log files, and configuration files.
•
flight-recorder trace 1
This command takes snapshot of always-on-trace data.
•
flight-recorder all 1
The command creates a flight-recorder snapshot, trace and archive.
•
flight-recorder archive 1
This command creates a tarball of flight-recorder files, log files and configuration files.
Troubleshooting tool fundamentals
January 2017 Troubleshooting 30
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