Prepare the vCenter Server system for joining a Linked Mode group.

Before joining a vCenter Server to a Linked Mode group, review Linked Mode Considerations for vCenter Server.

All the requirements for standalone vCenter Server systems apply to Linked Mode systems.

The following requirements apply to each vCenter Server system that is a member of a Linked Mode group:

Linked Mode groups that contain both vCenter Server 5.0 and earlier versions of vCenter Server are not supported. The vSphere Client does not function correctly with vCenter Servers in groups that have both version 5.0 and earlier versions of vCenter Server. Do not join a version 5.0 vCenter Server to earlier versions of vCenter Server, or an earlier version of vCenter Server to a version 5.0 vCenter Server. Upgrade any vCenter Server instance to version 5.0 before joining it to a version 5.0 vCenter Server.

To join a Linked Mode group the vCenter Server must be in evaluation mode or licensed as a Standard edition. vCenter Server Foundation and vCenter Server Essentials editions do not support Linked Mode.

DNS must be operational for Linked Mode replication to work.

The vCenter Server instances in a Linked Mode group can be in different domains if the domains have a two-way trust relationship. Each domain must trust the other domains on which vCenter Server instances are installed.

When adding a vCenter Server instance to a Linked Mode group, the installer must be run by a domain user who is an administrator on both the machine where vCenter Server is installed and the target machine of the Linked Mode group.

All vCenter Server instances must have network time synchronization. The vCenter Server installer validates that the machine clocks are not more than five minutes apart.