Applies to: Exchange Server 2013

Topic Last Modified: 2012-09-17

Use the Add-DatabaseAvailabilityGroupServer cmdlet to add a Mailbox server to a database availability group (DAG). A DAG is a set of Mailbox servers that use continuous replication and managed availability to provide automatic database-level recovery from database, server, or network failures.

For information about the parameter sets in the Syntax section below, see Syntax.


Add-DatabaseAvailabilityGroupServer -Identity <DatabaseAvailabilityGroupIdParameter> -MailboxServer <ServerIdParameter> [-Confirm [<SwitchParameter>]] [-DomainController <Fqdn>] [-SkipDagValidation <SwitchParameter>] [-WhatIf [<SwitchParameter>]]



This example adds the Mailbox server MBX1 to the DAG DAG1.

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Add-DatabaseAvailabilityGroupServer -Identity DAG1 -MailboxServer MBX1

Detailed Description

A computer object for a DAG is created in Active Directory when the first server is added to the DAG. This object is used to authenticate servers to each other within a DAG.

To add a Mailbox server to a DAG, the Mailbox server must be running the Windows Server 2008 R2 Enterprise or Datacenter operating system or Windows Server 2012 Standard or Datacenter operating system and it must not belong to any other DAG. The Mailbox server must be running the same versions of the Windows operating system and Microsoft Exchange, and be in the same Active Directory domain as all other Mailbox servers in the DAG. In addition, the Mailbox server must not be configured as an Active Directory domain controller or global catalog server.

To add the first server to a DAG and create a computer object for the DAG, the Exchange Windows Permissions security group must have the appropriate rights to add computer accounts to the domain. Alternatively, a computer account can be created and disabled prior to adding the server. Adding the first server to the DAG enables the computer account for the DAG. Thus, the account used for the task doesn't need permissions to add a computer account to the domain. If you're pre-creating the computer account, the name of the account must match the name for the DAG. For example, if the DAG is named DAG1, the computer account must be named DAG1.

You need to be assigned permissions before you can run this cmdlet. Although all parameters for this cmdlet are listed in this topic, you may not have access to some parameters if they're not included in the permissions assigned to you. To see what permissions you need, see the "Database availability groups" entry in the High Availability and Site Resilience Permissions topic.


Parameter Required Type Description




The Identity parameter specifies the name of the DAG to which the server is being added.




The MailboxServer parameter specifies the name of the Mailbox server being added to the DAG.




The Confirm switch causes the command to pause processing and requires you to acknowledge what the command will do before processing continues. You don't have to specify a value with the Confirm switch.




The DomainController parameter specifies the fully qualified domain name (FQDN) of the domain controller that writes this configuration change to Active Directory.




The SkipDagValidation switch specifies whether to bypass the validation of the DAG's quorum model and the health check on the DAG's witness when adding members to the DAG.




The WhatIf switch instructs the command to simulate the actions that it would take on the object. By using the WhatIf switch, you can view what changes would occur without having to apply any of those changes. You don't have to specify a value with the WhatIf switch.

Input Types

To see the input types that this cmdlet accepts, see Cmdlet Input and Output Types. If the Input Type field for a cmdlet is blank, the cmdlet doesn’t accept input data.

Return Types

To see the return types, which are also known as output types, that this cmdlet accepts, see Cmdlet Input and Output Types. If the Output Type field is blank, the cmdlet doesn’t return data.