Information Technology Reference
In-Depth Information
Table 3.1:
Maximum number of hosts or VMs per vCenter Server instance
vCenter Server
!.
vCenter
Server !.
vCenter Server
#.
Item
→
#.#
ESXi hosts per vCenter Server instance
200
1,000
1,000
VMs per vCenter Server instance
3,000
10,000
10,000
Before you install additional vCenter Server instances, you must verify the following
prerequisites:
All computers that will run vCenter Server in a linked mode group must be members of
a domain. The servers can exist in different domains only if a two-way trust relationship
exists between the domains.
◆
DNS must be operational. Also, the DNS name of the servers must match the server name.
◆
The servers that will run vCenter Server cannot be domain controllers or terminal servers.
◆
You cannot combine vCenter Server 5 instances in a linked mode group with earlier ver-
sions of vCenter Server.
◆
vCenter Server instances in linked mode must be connected to a single SSO server, a two-
node SSO cluster, or two nodes in multisite mode.
◆
Windows vCenter is required. Linked mode is not supported with the Linux-based vCen-
ter virtual appliance.
◆
Each vCenter Server instance must have its own backend database, and each database must
be coni gured as outlined earlier with the correct permissions. The databases can all reside on
the same database server, or each database can reside on its own database server.
Using Multiple vCenter Server Instances with Oracle
If you are using Oracle, you'll need to make sure that each vCenter Server instance has a diff erent
schema owner or uses a dedicated Oracle server for each instance.
After you have met the prerequisites, installing vCenter Server in a linked mode group is
straightforward. You follow the steps outlined previously in “Installing vCenter Server” until
you get to step 10. In the previous instructions, you installed vCenter Server as a stand-alone
instance in step 10. This sets up a master ADAM instance that vCenter Server uses to store its
coni guration information.
