You can install
vCenter Server on a physical system or on a virtual machine running on an ESXi host. You can also download and deploy the vCenter Server Appliance on an ESXi host 5.0 or later, or on a vCenter Server instance 5.0 or later.
Preparing vCenter Server Databases for Install vCenter Server requires a database to store and organize server data. You can either use the bundled PostgreSQL database that can be installed and configured at deployment time, or you can set up an external database.
How vCenter Single Sign-On Affects Installation Starting with version 5.1, vSphere includes a vCenter Single Sign-On service as part of the vCenter Server management infrastructure. This change affects vCenter Server installation.
Synchronizing Clocks on the vSphere Network Make sure that all components on the vSphere network have their clocks synchronized. If the clocks on the machines in your vSphere network are not synchronized, SSL certificates, which are time-sensitive, might not be recognized as valid in communications between network machines.
Using a User Account for Running vCenter Server You can use the Microsoft Windows built-in system account or a user account to run vCenter Server. With a user account, you can enable Windows authentication for SQL Server, and it provides more security.
Installing vCenter Server on IPv6 Machines Starting with vSphere 6.0, vCenter Server supports connection between vCenter Server and vCenter Server components by either IPv4 or IPv6 addresses.
Running the vCenter Server Installer from a Network Drive You can run the vCenter Server installer from a network drive, but you cannot install the software on a network drive.
Required Information for Installing vCenter Server When you install vCenter Server with an embedded or external Platform Services Controller, the installation wizard prompts you for the installation information.
Required Information for Deploying the vCenter Server Appliance When you deploy the vCenter Server Appliance with an embedded or external Platform Services Controller, the installation wizard prompts you for the deployment information.