vSphere Cluster Services are disabled by Retreat Mode. vSphere DRS is not functioning and vSphere HA will not perform optimally

Products

• VMware vCenter Server

Issue/Introduction

Symptoms : 

• Observed Alert on two storage clusters - "vSphere Cluster Services are disabled by Retreat Mode. vSphere DRS is not functioning and vSphere HA will not perform optimally"
• Cluster shows alerts indicating it is in "Retreat Mode"

Environment

• VMware vCenter Server 7.0.x
• VMware vCenter Server 8.0.x

Cause

The Storage Cluster shows alerts indicating it is in "Retreat Mode" instead of system managed mode. 

Example :

Problematic Hosts : The vCLS mode is enabled on Retreat mode. 

Working Host : The vCLS mode is enabled on system mode. 

Resolution

To Enable System Managed mode for your storage cluster, please follow below steps. 

• Log into vCenter's Web Client
• In Hosts and Clusters inventory, select a cluster.
• Click on the Configure tab.
• Under vSphere Cluster Services, select General.
• In the top right, click on EDIT VCLS MODE.
• In the Edit vCLS Mode pop up window, click on the First radio option System Managed mode. 
• Click OK.