Citrix Systems 1.8 manual Accounting

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Server farms can include multiple domains as long as a common base of user accounts exists between the domains. In the example above, the trust relationship between Domain 1 and Domain 2 determines the user account base.

Each domain can contain a single or multiple servers. As with a farm containing multiple servers from a single domain, a multiple domain farm cannot include workgroup servers and cannot include user accounts local to each server in the base of user accounts.

If necessary, you can create multiple farms on your network. Multiple farms are administered independently of each other—no published application information is shared between farms.

Some reasons why you might want to create multiple farms include:

Accounting and	If you track resource utilization in order to charge separate
charge-back	departments, you can create separate farms for the respective
	departments.
Geographical split	Although farms can span a geographical split, it may not be
	practical from an administrative point of view to create a single
	farm that must be administered by two IT groups in two different
	locations.
Lack of common	If your Citrix servers must provide applications to groups of
user account base	domain users that cannot comprise a single common user account
	base (the involved domains cannot trust each other), you must
	create separate farms.