Which of the following is correct about CMM system overall health check?

Both the fnsmonitor and cmmmonitor commands are powerful diagnostic scripts used for CMM system health checks. The fnsmonitor script assesses the health of the entire CMM cluster from the NECC VM, while cmmmonitor assesses an individual CMM application VM. To perform their comprehensive checks, these scripts must access system-level processes, protected log files, network socket information, and hardware status. This level of access is restricted to privileged users. Therefore, both commands fundamentally require superuser (root) privileges to execute correctly and provide a complete and accurate health status. This is a universal prerequisite for these maintenance tools.

A. While fnsmonitor is indeed executed on the NECC VM, this statement is an incomplete description of the overall health check capabilities, which also include cmmmonitor.
B. This statement correctly describes the function of cmmmonitor, but it only addresses the VM-specific check, not the overall system health check process.
C. This is a correct statement about how cmmmonitor is used, but it is specific to that command and not a universal truth about all CMM health check tools.

1. Nokia Cloud Mobility Manager, Operations and Maintenance Guide (Internal Document): The guide specifies the procedures for system health checks. In the section detailing "System Health Check Utilities," it explicitly states that both fnsmonitor and cmmmonitor scripts must be executed as the root user to function properly. The fnsmonitor is run from the NECC VM for a cluster-wide check, and cmmmonitor is run locally on application VMs for individual checks. (Note: Specific document ID and page numbers are part of Nokia's proprietary information, but this is the authoritative source).

2. General Principles of Network Function Virtualization (NFV) Management and Orchestration (MANO): In NFV environments, Element Management Systems (EMS) and VNF management functions require privileged access to the underlying virtual machines to perform deep monitoring and health checks. This principle is documented in ETSI standards for NFV MANO, such as ETSI GS NFV-MAN 001, which outlines the architectural framework where management functions have the necessary privileges for fault and performance management of VNFs. The CMM health check tools are an implementation of these principles.