Linked Mode Considerations
Sunday, January 02, 2011
The following requirements apply to each vCenter Server system that is a member of a Linked Mode group:
1. DNS must be operational for Linked Mode replication to work.
2. 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.
3. 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.
4. All vCenter Server instances must have network time synchronization. The vCenter Server installer validates that the machine clocks are not more than 5 minutes apart.
Linked Mode Considerations
There are several considerations to take into account before you configure a Linked Mode group.
1. Each vCenter Server user sees the vCenter Server instances on which they have valid permissions.
2. If you are joining 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.
3. 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 they are different accounts.
4. 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.
5. You cannot join a Linked Mode group during the upgrade procedure when you are upgrading from VirtualCenter 25 to vCenter Server 4.1. You can join after the upgrade to vCenter Server is complete. See the Upgrade Guide
6. A conflict results if the joining system and the Linked Mode group each contain a role with the same name
but with different privileges.
7. After you form a Linked Mode group, you can log in to any single instance of vCenter Server and view and manage the inventories of all the vCenter Servers in the group. It might take several seconds for the global data (such as user roles) that are changed on one machine to be visible on the other machines. The delay is usually 15 seconds or less. It might take a few minutes for a new vCenter Server instance to be recognized and published by the existing instances, because group members do not read the global data very often.
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