Feature |
Product |
Release introduced |
---|---|---|
Flight Recorder for system monitoring |
5320 Series |
Fabric Engine 8.6 |
5420 Series |
VOSS 8.4 |
|
5520 Series |
VOSS 8.2.5 |
|
5720 Series |
Fabric Engine 8.7 |
|
7520 Series |
Fabric Engine 8.10 |
|
7720 Series |
Fabric Engine 8.10 |
|
VSP 4900 Series |
VOSS 8.1 |
|
VSP 7400 Series |
VOSS 8.0 |
The Flight Recorder is a high level term for the framework in place on the switch 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 CLI
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 CLI. This feature uses the following commands:
flight-recorder all {slot[-slot][,...]}
The command creates a flight-recorder snapshot, trace and archive.
flight-recorder archive {slot[-slot][,...]}
This command creates a tarball of flight-recorder files, log files, and configuration files.
flight-recorder snapshot {slot[-slot][,...]}.
This command takes a snapshot of PMEM data.
flight-recorder trace {slot[-slot][,...]}
This command takes a snapshot of always-on-trace data.