VM is not accessible, network partition alarm

Products

• VMware vSAN 7.x

Issue/Introduction

6 node vSAN cluster

vSAN Health Service - Network Health - vSAN Cluster Partition Alert triggered

VMs inaccessible

 

Environment

VMware vSAN (All Versions)

 

 

Cause

This is due to one of the upstream switches 3 of the hosts were connected to wasn't powered on resulting in a network partition

 

Resolution

Following KB  Troubleshooting vSAN Networking section marked "MTU Check via vmkping" ran the below script which confirmed vSAN traffic wasn't flowing to all hosts in the cluster.

for i in `localcli vsan cluster unicastagent list | grep true | awk '{ print $4}'`; do echo "pinging $i 20 times"; echo; vmkping -I vmk1 $i -s 1472 -d -c 20 -i .005; e
cho; echo "**************************"; done