VMs Do Not Migrate During Upgrade
Description
Upgrading ESXi cluster fails with error "Node maintenance mode failed". This occurs in an online and healthy ESXi cluster where DRS and HA is enabled.
Action
Try the following workarounds in the following order:
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If HA admission control policy is enabled and set to slot policy, change it to cluster resource percentage to tolerate one host failure and then retry upgrade.
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Disable HA admission control policy or disable HA and then retry upgrade.
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Try powering off a few VMs to make sure there is enough failover capacity in the cluster to tolerate at least one node failure and then retry upgrade.