When you migrate vCenter Server or vCenter Single Sign-On on Windows to an appliance, the installer does a pre-check, for example, to verify that enough space is available on the source machine, and verifies that the external database, if any, can be successfully accessed.

When you migrate vCenter Single Sign-On (version 5.5), the vCenter Single Sign-On is included as part of the Platform Services Controller.

If your vCenter Server service is running in a service user account for access to the vCenter Server database and you run Migration Assistant under a different account, the Migration Assistant account must have the Replace a process level token permission.

The pre-migration checker performs checks for the following aspects of the source environment:

Network connections

Internal and external port availability

Administrator privileges on the Windows machine

Any credentials that you enter

Supported product and version

Administrator privilege for launching Migration Assistant

Migration Assistant port availability

Export directory space and permission requirements

System name validity

Inventory size compatibility

External vCenter Single Sign-On version

vCenter Single Sign-On and vCenter Server certificate compatibility

NTP server validity

The pre-migration checker performs checks for the following aspects of the target environment:

Network connections

Target vCenter Server IP address

Minimum processor requirements

Minimum memory requirements

Minimum disk space requirements

Permissions on the selected install and data directory

Internal and external port availability

Administrator privileges on the target host

Any credentials that you enter