...

• transaction_timeout, retry_count should be consistent across all nodes
• discovery: it should be clear why this is on or off on a particular node

Debug Logs

 System logs only contain warning and error messages, so there are situations when debug logs are necessary too.

• When debugging a connection issue, make sure to obtain debug logs from both sides of the connection
• For debugging lnet, at least enable net debug logging: "lctl set_param debug=+net"
• If possible, reproduce on a "quiet" system to reduce the amount of data in the log.
• Make sure that debug log buffer is big enough, especially on a busy server, and that there's sufficient memory to hold the buffer.

Scenarios

Connectivity

This section describes the procedure for testing connectivity between nodes running Lustre. 

...