Enable VMmotion in VMware
Two ESXi servers, for example esx01 and esx02.
The CPU of both esx01 and esx02 are same family.
Both esx01 and esx02 are having same shared storage.
Configure NFS or iSCSI in both ESXi servers.
Access storage, and check Hosts tab, both ESXi servers should be in the list.
Add VMkernel Network Adapter with vMotion service, can be on an existing standard switch.