We have 2 nodes in cluster (ESXi 6.7 U1), also have a few standalone ESXi hosts (some of them are running ESXi 6.5). We are planning to live migrate / vMotion those VMs without any downtime on these standalone hosts to the cluster. We are looking for the options and recommendations including prerequisites to complete this activity
Thanks in advance
The main requirement for live migration is CPU compatibility, i.e. the target host needs provide at least those CPU instructions, that are present on the source host(s).
If that requirement is met, and you do have some spare licenses (for at least one additional host), which can temporarily be used to add the standalone hosts to the vCenter Server environment, then the following steps may work to migrate the VM's from the standalone hosts to the existing cluster.