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In the 6.7 Documentation for VUM Remediating Hosts it now has the following note:
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Note:
When you perform remediation on a cluster that consists of not more than two hosts, disabling HA admission control might not be enough to ensure successful remediation. You might need to disable vSphere Availability (HA) on the cluster. If you keep HA enabled, remediation attempts on host in the cluster fail, because HA cannot provide recommendation to Update Manager to place any of the hosts into maintenance mode. The reason is that if one of the two hosts is placed into maintenance mode there is no failover host left available in the cluster. To ensure successful remediation on a 2-node cluster, disable HA on the cluster or place the hosts in maintenance mode manually and then perform remediate the two host in the cluster.
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I agree that VUM should be able to disable HA during the upgrade process...