Cisco Cisco UCS B440 M1 High-Performance Blade Server Referências técnicas

This document describes how to use the hidden libfc debugs to gain low level visibility into the port
login (PLOGI) process used in Fibre Channel (FC) communication within ESXi.  By enabling
debug_logging we are able to see the Converged Network Adapter's (CNA) information about the
Extended Link Service (ELS) frames such as Fabric Login (FLOGI), Port Login (PLOGI), that we
normally would not be able to see.  This can be useful if there isn't a Finisar handy or a SPAN and
you want to ensure what the host is/isn't completing in the FC stack.

Contributed by Brian Hopkins, Cisco TAC Engineer.

Currently this is only supported on ESX with a Cisco Virtual Interface Card (VIC), other adapters
as far as I know do not support this feature.

You can use the following command on the ESXi host to ensure this value isn't already set:

The output should look like the following, notice how the value isn't configured for debug_logging,
which is the value we will be changing in the next steps.