When you deploy VMware Horizon in a vSphere environment, you will need to deploy and configure vCenter Server. You can install vCenter Server on the same server as your virtual desktops or RDS hosts or on separate servers. The virtual machine running vCenter Server requires much more memory and processing power than a desktop virtual machine.

The vCenter Virtual Machine Example table shows an example of the size of the virtual machine that contains vCenter Server.

Table 1. vCenter Server Virtual Machine Example
Item Example for a vCenter Server That Manages 10,000 Desktops Example for a vCenter Server That Manages 2,000 Desktops
Operating system 64-bit Windows Server 2012 R2 Enterprise 64-bit Windows Server 2012 R2 Enterprise
RAM 48GB 10-24GB, depending on vSphere version
Virtual CPU 16 2 -8, depending on vSphere version
System disk capacity 180GB 40GB
Virtual SCSI adapter type LSI Logic SAS (the default for Windows Server 2008) LSI Logic SAS (the default for Windows Server 2008)
Virtual network adapter E1000 (the default) VMXNET 3 (though E1000, the default, is fine too)
Maximum concurrent vCenter provisioning operations 20 20
Maximum concurrent power operations 50 50