Capacity Model Constraints

One of the following misconfiguration messages appear when an Exchange Server constraint occurs in the capacity model:

You have requested Standby Continuous Replication to <StandByDatacenters> standby datacenters, but only <MailboxSites> Mailbox Site(s) were marked as being standby datacenters.
There must be at least one Client Access Server.
At least one Client Access Server must be present in the same site as every Mailbox server.
At least one Hub Transport Server must be present in the same site as every Edge Transport Server.
The Inbox client type must always be present.
All clients must be mapped to a Mailbox Server.
Client <ClientName> in site <SiteName> must be mapped to <ServerName>
Outlook Anywhere clients must have a Client Access Server in the same site as their Mailbox Server.
Outlook Web Access clients must have a Client Access Server in the same site as their Mailbox Server.
There cannot be more than 200,000 mailboxes.
There must be at least one mailbox.
There must be at least one Hub Transport Server.
There must be at least one Mailbox Server.
At least one Hub Transport Server must be present in the same site as every Mailbox server.
The <RoleA> and <RoleB> roles cannot be installed on the same computer.
Multiple Mailbox Server roles cannot be installed on the same computer.

Typically, one of these adjustment messages appears when you have modified a capacity model by removing or adding a software role that is required, or when a server role has been added to a server that conflicts with another server role. The table below describes server roles, and how they can and cannot be collocated with other components.

Exchange Server Service Component	Constraint	Requires Supporting Component
ActiveSync client	Not required	Client Access
Client Access	Required Required for ActiveSync, Outlook Web Access, and Outlook Anywhere clients Must be present in every site that contains a Mailbox server	None
Edge Transport	Required if e-mail is sent to or received from the Internet Must be connected to the perimeter network. Cannot be collocated with any other component.	There must be a Hub server in the same site.
Hub Transport	Required There must be at least one Hub Transport. Cannot connect to a perimeter network.	None
Inbox	Required	Mailbox
Mailbox, Simple (unclustered)	At least one mailbox type is required Cannot connect to a perimeter network.	Hub Transport, installed on a separate server in the same site
Mailbox, CCR	At least one mailbox type is required Cannot connect to a perimeter network. Active and passive nodes cannot be collocated with any other component.	Passive CCR, installed on separate server in the same site Hub Transport, installed on a separate server in the same site
Mailbox, LCR	At least one mailbox type is required Cannot connect to a perimeter network.	Hub Transport, installed on a separate server in the same site
Mailbox, SCC	At least one mailbox type is required Cannot connect to a perimeter network. Active and passive nodes cannot be collocated with any other component.	Passive SCC, installed on separate server in the same site Hub Transport, installed on a separate server in the same site
Mailbox, SCR	At least one mailbox type is required Cannot connect to a perimeter network. Active and passive nodes cannot be collocated with any other component.	Passive SCR, installed on separate server in the same site Hub Transport, installed on a separate server in the same site
Outlook Anywhere	Not required	Client Access
Outlook (Cached)	Not required	Mailbox
Outlook (online)	Not required	Mailbox
Outlook Web Access	Not required	Client Access

To make the required adjustments, use one of the following procedures:

To edit a server role in the Model Editor procedure in the How to Edit a Server Hardware Configuration or a Server Role in the Model Editor topic to add a required role
To edit a client profile in the Model Editor procedure in the How to Add, Edit, or Delete a Client Profile in the Model Editor topic to map clients to a mailbox server or to reduce the number of clients in the profile
To move a software component between servers procedure in the How to Move A Server Role Between Servers topic to move a role from one server to another

See Also

Tasks