VxRail uses the Loudmouth service for automatic node discovery. This service relies on IPv6 multicast packets sent by new nodes on the VxRail management network. The VxRail Manager listens for these packets to discover available nodes. When a node is not discovered, the loudmouth.log file is the primary resource to analyze. It contains detailed information about the discovery process, including multicast packet transmission and reception, which helps diagnose network connectivity issues (like blocked multicast traffic or VLAN misconfigurations) or problems with the Loudmouth service itself on either the new node or the VxRail Manager.

A. lcm.log: This log file is associated with the Life Cycle Management (LCM) process, which handles software and firmware updates, not initial node discovery.

B. marvin.log: This is the main log for the VxRail Manager service. While it may contain high-level entries, the loudmouth.log is specifically for the discovery protocol.

D. mystic.log: This log pertains to cluster configuration and host management tasks that occur after a node has been successfully discovered and is being added to the cluster.

1. Dell VxRail Appliance Log Collection Guide: In the section "VxRail Manager Log Files," the loudmouth.log is described as the log for the "Node discovery and IP configuration for new nodes" service. This directly links the log file to the scenario in the question. (Reference: Dell VxRail Appliance Log Collection, Page 10, Table 3: VxRail Manager Log Files).

2. Dell VxRail Troubleshooting Guide: The guide details the node discovery process, explaining that nodes use multicast announcements via the Loudmouth service. Troubleshooting steps for discovery failures consistently point to verifying network multicast functionality and checking the loudmouth.log for errors related to the discovery service. (Reference: Dell VxRail 7.0.xxx Troubleshooting Guide, Section: "Node Discovery Issues").