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Siebel Server Installation Guide for Microsoft Windows > Preparing for the Installation > Planning Your Siebel Deployment >

Grouping Your Siebel Servers into Siebel Enterprise Servers

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A Siebel Enterprise Server consists of a logical group of Siebel Servers configured to share a single Siebel Gateway Name Server, Siebel Database Server, and Siebel File System. These Siebel Servers can, as a result, be administered collectively rather than individually.

The Siebel Enterprise Server has the following components:

Multiple Siebel Servers. Siebel Servers execute business logic for Siebel clients and access the Siebel Database Server on the clients' behalf.
Each Enterprise Server must have at least one Siebel Server.
Each Siebel Server must belong to one and only one Enterprise Server.
The Siebel Servers that belong to a particular Enterprise Server must all be installed on computers that belong to the same domain.
One Name Server. The Siebel Gateway Name Server does not have to be reserved for the exclusive use of a single Enterprise Server, but each Enterprise Server can be connected to only one Name Server.

Larger installations may also include:

Two Dedicated Central Dispatch Schedulers. Central Dispatch provides load-balancing for Siebel Servers. For information about using Central Dispatch, see Implementing Load-Balancing with Central Dispatch.

One machine must be configured to act as the primary Central Dispatch scheduler and another to act as a secondary, or backup, scheduler.

You must install Central Dispatch on Siebel Servers if you intend to deploy:

Siebel Object Managers capable of being load-balanced (such as Call Center, eSales, and others) across Siebel Servers
Load-balancing on Web servers

An exception to the previously described deployment rules occurs if you will be operating multiple servers as part of a cluster. In this case, you may not install Central Dispatch on machines you will be clustering. Instead, you will install Central Dispatch on servers you reserve for performing load balancing. For complete information, see Implementing Load-Balancing with Central Dispatch. Before installing Central dispatch, consult the Supported Network Interface Card (NIC) matrix available on Siebel SupportWeb. Most of the unsupported network cards on this matrix should be compatible with Central Dispatch. However, please first test any unsupported network cards with Central Dispatch before full deployment. If the network card is found to be compatible but not on the supported list, please contact Technical Support so it can be added to the supported list.

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