ESXi Maintenance mode improvements | VMware

Normally when an ESXi host is placed into maintenance mode, all the Powered On VMs will be migrated first to the other hosts in the cluster using DRS, then comes Powered Off VMs and finally VM templates.

Starting from vSphere 6.0 u2, VMware has changed the order. Now when a host is placed into maintenance mode, first the Powered Off VMs will be moved, then VM templates and finally the Powered On VMs.

Reason for change:
Prior to 6.0 U2, when users initiate Maintenance mode in ESXi, they lose the ability to deploy VMs using the templates until the migration completes. Even though the templates are migrated in the last place, ESXi host would have already queued the VM Templates and Powered Off VMs in its migration process. When we consider hosts with 40-50 VMs, users might need to wait for some time to work with the templates or to Power On a VM. Therefore VMware decided to make this small change which might turn useful to administrators atleast at some point of time.

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