VMware VCENTER SERVER 4.0 - GETTING STARTED UPDATE 1 Specifications Page 52

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The following requirements apply to each vCenter Server system that is a member of a Linked Mode group:
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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.
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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.
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DNS must be operational for Linked Mode replication to work.
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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.
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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.
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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.
Linked Mode Considerations for vCenter Server
Consider several issues before you configure a Linked Mode group.
Before you configure a Linked Mode group, consider the following issues.
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If you upgrade a vCenter Server that is part of a Linked Mode group, it will be removed from the group.
vCenter Server does not support Linked Mode groups that contain both version 5.0 and earlier versions
of vCenter Servers. After all vCenter Servers in the group are upgraded to version 5.0, you can rejoin them.
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Each vCenter Server user sees the vCenter Server instances on which they have valid permissions.
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When you set up your vCenter Server Linked Mode group, you must install the first vCenter Server as a
standalone instance because you do not yet have a remote vCenter Server machine to join. Subsequent
vCenter Server instances can join the first vCenter Server or other vCenter Server instances that have joined
the Linked Mode group.
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If you join a vCenter Server to a standalone instance that is not part of a domain, you must add the
standalone instance to a domain and add a domain user as an administrator.
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The vCenter Server instances in a Linked Mode group do not need to have the same domain user login.
The instances can run under different domain accounts. By default, they run as the LocalSystem account
of the machine on which they are running, which means that they are different accounts.
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During vCenter Server installation, if you enter an IP address for the remote instance of vCenter Server,
the installer converts it into a fully qualified domain name.
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You cannot join a Linked Mode group during the upgrade procedure when you are upgrading from
VirtualCenter 25 to vCenter Server 5.0. You can join after the upgrade to vCenter Server is complete.
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CAUTION If you need to uninstall and reinstall vCenter Server on more than one member of a Linked
Mode group, do so with a single vCenter Server at a time. Uninstalling and reinstalling multiple linked
vCenter Servers at the same time is not supported, and can cause errors that prevent vCenter Server from
connecting to vCenter Inventory Service. If it is necessary to uninstall and reinstall multiple linked vCenter
Servers at the same time, isolate them from the Linked Mode group first, and rejoin them to the Linked
Mode group after the reinstallation is complete.
vCenter Server and Host Management
52 VMware, Inc.
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