Applies to: Exchange Server 2010 SP3, Exchange Server 2010 SP2
Topic Last Modified: 2011-09-07
Use the Restore-DatabaseAvailabilityGroup cmdlet as part of a datacenter switchover.
Syntax
Restore-DatabaseAvailabilityGroup -Identity
<DatabaseAvailabilityGroupIdParameter> [-ActiveDirectorySite
<AdSiteIdParameter>] [-AlternateWitnessDirectory
<NonRootLocalLongFullPath>] [-AlternateWitnessServer
<FileShareWitnessServerName>] [-Confirm
[<SwitchParameter>]] [-DomainController <Fqdn>]
[-WhatIf [<SwitchParameter>]]
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Detailed Description
The Restore-DatabaseAvailabilityGroup cmdlet can
be run against a DAG only when the DAG is configured with a
DatacenterActivationMode parameter value of
DagOnly. For more information about the
DatacenterActivationMode parameter, see Understanding Datacenter
Activation Coordination Mode. For more information about
datacenter switchovers, see Datacenter
Switchovers.
You can use the Set-DatabaseAvailabilityGroup cmdlet to configure the value for the DatacenterActivationMode parameter.
The Restore-DatabaseAvailabilityGroup cmdlet performs several operations that affect the structure and membership of the DAG’s cluster. This task will:
- Forcibly evict the servers listed on the StoppedServersList
from the DAG’s cluster, thereby reestablishing quorum for the
cluster enabling the surviving DAG members to start and provide
service.
- Configure the DAG to use the alternate witness server if there
is an even number of surviving DAG members.
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 Group Permissions" section in the High Availability Permissions topic.
Parameters
| Parameter | Required | Type | Description |
|---|---|---|---|
|
Identity |
Required |
Microsoft.Exchange.Configuration.Tasks.DatabaseAvailabilityGroupIdParameter |
The Identity parameter specifies the name of the DAG being manipulated. |
|
ActiveDirectorySite |
Optional |
Microsoft.Exchange.Configuration.Tasks.AdSiteIdParameter |
The ActiveDirectorySite parameter specifies the site containing the DAG members to be restored. |
|
AlternateWitnessDirectory |
Optional |
Microsoft.Exchange.Data.NonRootLocalLongFullPath |
The AlternateWitnessDirectory parameter specifies the name of an alternate directory that's used to store witness data. The specified directory must not be in use by any other DAGs or used for any other purpose. This value can be populated ahead of time by using the Set-DatabaseAvailabilityGroup cmdlet. |
|
AlternateWitnessServer |
Optional |
Microsoft.Exchange.Data.FileShareWitnessServerName |
The AlternateWitnessServer parameter specifies the name of a new witness server for the DAG as part of a site activation process. This value can be populated ahead of time by using the Set-DatabaseAvailabilityGroup cmdlet. |
|
Confirm |
Optional |
System.Management.Automation.SwitchParameter |
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. |
|
DomainController |
Optional |
Microsoft.Exchange.Data.Fqdn |
The DomainController parameter specifies the fully qualified domain name (FQDN) of the domain controller that writes this configuration change to Active Directory. |
|
WhatIf |
Optional |
System.Management.Automation.SwitchParameter |
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.
Errors
| Error | Description |
|---|---|
|
This command can only be run on a database availability group (DAG) when the DatacenterActivationMode parameter for the DAG is set to DagOnly. (Error 3EBE1F79). |
Indicates that datacenter activation mode isn't enabled for the
DAG. Use the Set-DatabaseAvailabilityGroup cmdlet to set the
DatacenterActivationMode parameter for the DAG to
|
Examples
EXAMPLE 1
This example activates member servers in a DAG named DAG1 for an Active Directory site named Portland. In this example, the values for the AlternateWitnessServer parameter and the AlternateWitnessDirectory parameter had been previously set by using the Set-DatabaseAvailabilityGroup cmdlet. Thus, there is no need to specify them here.
 Copy Code |
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Restore-DatabaseAvailabilityGroup -Identity DAG1 -ActiveDirectorySite Portland |
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EXAMPLE 2
This example activates member servers in a DAG named DAG1 for an Active Directory site named Redmond. In this example, the values for the AlternateWitnessServer parameter and the AlternateWitnessDirectory parameter are being set as part of the activation process.
| Copy Code |
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|---|---|
Restore-DatabaseAvailabilityGroup -Identity DAG1 -ActiveDirectorySite Redmond -AlternateWitnessServer EXHUB1 -AlternateWitnessDirectory D:\DAG1 |
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