vSAN Health Service - Network - All hosts have a dedicated vSAN Max Client vmknic configured in server cluster

Products

• VMware vSAN

Issue/Introduction

This article introduces the new vSAN Skyline Health check 'All hosts have a dedicated vSAN Max Client vmknic configured in server cluster' in vSAN and provides details on why it might report the error and how to fix the error state.

Environment

VMware vSAN 9.0

Resolution

Q: What does the 'All hosts have a dedicated vSAN Max Client vmknic configured in server cluster' check do? 

When vSAN Max Client network is enabled on this cluster, each ESXi host in this cluster must have a dedicated vmknic configured for vSAN Max Client traffic. This check is to verify if all hosts in server cluster have a dedicated vmknic configured for vSAN Max Client traffic.

Q: What does it mean when it is in an error state?

If this test returns red, it means this host does not have a vmknic configured for vSAN Max Client traffic or it has multiple vmknics configured for vSAN Max Client traffic unexpectedly, when vSAN Max Client Network is enabled on this cluster.

Note: it would cause network communication issues between the client cluster and server cluster without dedicated vSAN Max Client vmknic configured. 

Q: How does one troubleshoot and fix the error state?

For any host with no vSAN Max Client Network configured, please navigate to Host > Configure > Networking > VMkernel Adapters, and enable 'vSAN Max Client' for the selected VMKernel adapter.
For any host with multiple vSAN Max Client vmknics configured, please navigate to Host > Configure > Networking > VMkernel Adapters, and unselect unnecessary VMKernel adapters to only keep one vSAN Max Client vmknic for the host.