vSAN -- While using Quickstart - Host cannot enter Maintenance Mode / Node fails repeatedly to enter Maintenance Mode with the error: "General vSAN error. vSAN resource check has failed"

Products

• VMware vSAN
• VMware vSAN 7.x
• VMware vSAN 8.x

Issue/Introduction

You worked with the vSAN Quickstart in the vSphere Client and observed the Warning "All required hosts are in maintenance mode."
(Cluster --> Configure --> Configuration --> Quickstart)

You proceeded with the attempt to put Host(s) in Maintenance Mode (which were showing as not being in Maintenance Mode in the vSphere Client) 

but receiving the error: "General vSAN error. vSAN resource check has failed on host .... "

In the vSphere Client you observe the related Host is not in Maintenance Mode while most of the other vSAN Hosts are in Maintenance Mode:

Example Output:

Environment

vSAN 7.x

vSAN 8.x

Cause

Inconsistency within the vSphere Client in relation to Quickstart feature. 

Resolution

1.) Put all Hosts out of Maintenance Mode by using the vSphere Client

2.) Navigate to Quickstart Feature ( Cluster --> Configure --> Configuration --> Quickstart ) and hit "Re-Validate"

3.) You observe that Quickstart is now showing all green checkmarks and the message "All required hosts are in maintenance mode." is gone

Example Output: