VMware vCenter server Appliance 6.7 U1 (VCSA) is a VM running Photon OS, which is hardened and optimized VMware Linux distribution. All future releases will only be available as VCSA which is the preferred deployment method of vCenter Server. If you’re running an older version of vCenter server on Windows, you can migrate to VCSA via a built-in migration tool. The migration process is quite easy, but today we’ll focus only on clean installation and configuration of VCSA in a new environment.