2.3.5 The Cluster Management, Monitoring, and Directory Service (CMMDS)
The CMMDS handles all vSAN inventory of objects, hosts, disks, network interfaces, policies, names, and so on. It is the central directory which:
• All hosts join to perform elections through it.
• Other architecture elements (like DOM/LSOM) publish into CMMDS to update the directory about objects, components, and so on.
In addition:
• If CMMDS cannot communicate or update information, it will cause production problems in the vSAN cluster.
• After something is published into CMMDS, information about it can be found from any node that is part of the cluster using cmmds-tool.
• Network-partitions and communication problems typically manifest through CMMDS.