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vSphere Web Client displays alerts for network partitions of a vSAN cluster (2109242)

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Details

This knowledge base article explains why you might see network partitions for a vSAN cluster, but you cannot find any relevant error messages for what causes the network partitions.

If you create a vSAN cluster for which you configure the hosts to use only multicast connectivity, the cluster is created temporarily, and all the hosts in the cluster are put in one network partition. If one of the hosts from the cluster drops out from the vSAN cluster, the vSphere Web Client might start displaying alerts for network partitions. 
This issue occurs because the host attempts to automatically rejoin the vSAN cluster but fails because the unicast connection is shut down. After a few such unsuccessful attempts, the process the host to reconnect to the cluster times out. The vSphere Web Client does not display any alerts for the host trying to reconnect to the vSAN cluster, hence you cannot understand what caused the alerts for the network partitions. 

Solution

To avoid this issue, make sure that the hosts from a vSAN cluster are able to use both multicast and unicast connectivity.

For more information on how to troubleshoot the networking settings of a vSAN cluster, see Virtual SAN Troubleshooting: Multicast.

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