This article explains the All required hosts are in maintenance mode check in the vSAN Health Service and provides details on why it might report an error.

testID: com.vmware.vsan.health.test.hostinmm

Q: What does the All required hosts are in maintenance mode check do?

Maintenance mode is required for the hosts which need to be configured in the HCI workflow. This check is to ensure HCI cluster with all hosts met the requirement.

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

If this check fails, it indicates that some of the required hosts are not in maintenance mode. This check may be triggered during Quickstart if manual changes are made outside of the Quickstart process. 

Q: How to troubleshoot and fix the error state?

Check which hosts are not in maintenance mode in the detail table. Place them in maintenance mode. Verify all settings are consistent across the hosts via Quickstart.

For additional information regarding Quickstart see Using Quickstart to Configure and Expand a vSAN Cluster .