The PSC is deployed internally with vCenter Server or as an external component. The PSC contains infrastructure services such as Single Sign On, Certificate Authority, licensing, etc. From vSphere 6 onwards the Platform Services Controller (PSC) was introduced to the vSphere architecture.To check version compatibility with other VMware products see the Product Interoperability Matrix.Any hosts you plan on connecting to vCenter 6.5 should be running version 5.5 or above.as these may need upgrading for vSphere 6.5 compatibility. You must check compatibility of any third party products and plugins that might be used for backups, anti-virus, monitoring, etc.You can review a full list of compatible versions at the Database Interoperability Matrix. An external database should be Microsoft SQL Server 2008 R2 SP2 or above, or Oracle 11g or 12c.For environments with up to 20 hosts and 200 VMs the bundled internal Postgres database can be used.
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The operating system should be 64 bit and Windows Server 2008 SP2 or above.