Vmware Vcenter Server in Linked Mode
What is Linked Mode?
Linked Mode allow to join multiple vCenter Server systems using vCenter Linked Mode to allow them to share information. When a server is connected to other vCenter Server systems using Linked Mode, you can connect to that vCenter Server system and view and manage the inventories of the linked vCenter Server systems.
Linked Mode uses Microsoft Active Directory Application Mode (ADAM) to store and synchronize data across multiple vCenter Server systems. ADAM is installed as part of vCenter Server installation. Each ADAM instance stores data from the vCenter Server systems in the group, including information about roles and licenses. This information is replicated across all of the ADAM instances in the connected group to keep them in sync.
When vCenter Server systems are connected in Linked Mode, you can perform the following actions:
Log in simultaneously to vCenter Server systems for which you have valid credentials.
Search the inventories of the vCenter Server systems in the group.
View the inventories of the vCenter Server systems in the group in a single inventory view.
Linked Mode Prerequisites
Join a Linked Mode Group After Installation
Linked Mode Prerequisites for vCenter Server
■vCenter Server does not support Linked Mode groups that contain both version 5.x and pre-5.0 versions of vCenter Server. Similarly, vCenter Server does not support Linked Mode groups that contain different 5.x versions of vCenter Server or different versions of vCenter Single Sign-On. After all 5.x vCenter Server and vCenter Single Sign-On instances in a Linked Mode group are upgraded to the same 5.x version, you can rejoin them.
■Make sure that all vCenter Servers in a Linked Mode group are registered to the same vCenter Single Sign-On server.
■To join a vCenter Server to another vCenter Server in Linked Mode, the currently logged-in user who is performing the join operation must have access to the vCenter Server database of each vCenter Server.
■When you join 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.
■When you join a vCenter Server instance to a Linked Mode group, if User Account Control (UAC) is enabled on the machine, the join operation requires elevated privileges through the Run as administrator option. This is true even if the logged-in user is a domain administrator user.
■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.
■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. See Synchronizing Clocks on the vSphere Network
vCenter Linked Mode Installation Steps
- Go to the the Start menu, select All Programs > VMware > vCenter Server Linked Mode Configuration–> Modify linked mode configuration
2. Click Join vCenter Server instance to an existing linked mode group or another instance and click Next.
3. Click Next to proceed with Linked Mode Installation.
4. Type the server name and LDAP port number of any remote vCenter Server that is or will be a member of the group and click Next.
*If you enter an IP address, the installer converts it to a fully qualified domain name.*Also the vCenter Server installer detects a role conflict, select how to resolve the conflict.
A conflict results if the joining system and the Linked Mode group each contain a role with the same name but with different privileges
The role on the joining system is renamed to vcenter_namerole_name where vcenter_name is the name of the vCenter Server system that is joining the Linked Mode group and role_name is the name of the original role.
5. vCenter Server restarts.
Depending on the size of your inventory, the change to Linked Mode might take from a few seconds to a few minutes to complete.
The vCenter Server instance is now part of a Linked Mode 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.
This concludes the Linked Mode multiple vCenter installation and configuration.