https://www.howtogeek.com/313125/how-to-convert-between-preallocated-and-growable-disks-in-vmware/
Growing, thinning, and shrinking virtual disks for VMware ESX and ESXi
Storage vMotion to thin disk does not reclaim null blocks
http://www.v-grade.ru/doku.php?id=how-to-create-vmware-ha-cluster
ESX/ESXi hosts might experience read or write performance issues with certain storage arrays
https://tinkertry.com/easy-upgrade-to-esxi-60u2