Old core-dumps are found on an NSX appliance by:
get core-dumpsVMware NSX 4.x
At the point in time the core dump was created, there may have been an issue experienced within the environment.
As disk space on the appliances is limited, its recommended to remove core dumps once they are no longer needed for investigation.
get core-dumps
del core-dump alldel core-dump <core dump file here>