How to check AD LDS or AD DS replication ?

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The AD replication PowerShell cmdlets that we’ll look at are available on Windows Server 2012, Windows Server 2012 R2, Windows 8.0 and Windows 8.1. You must install Remote Server Administration Tools (RSAT) for AD DS on non-domain controllers to use these PowerShell cmdlets.


1. Get-ADReplicationFailure


The Get-ADReplicationFailure PowerShell cmdlet can be used to check AD replication status for all or specific Active Directory domain controllers. The Get-ADReplicationFailure cmdlet helps you get the information about replication failure for a specified server, site, domain, or Active Directory forest. For example, to get the replication status for a specific domain controller, failure counts, last error, and the replication partner it failed to replicate with, execute the command below:


Get-ADReplicationFailure DC1.mydomain.local


You can also set the scope to see the replication status for all domain controllers in a specific site. As an example, the below command returns the replication status for all domain controllers in the Atlanta Active Directory site and populates the result in a table:


Get-ADReplicationFailure -scope SITE -target Atlanta | FT Server, FirstFailureTime, FailureClount, LastError, Partner -AUTO


The above command fetches the replication status of all domain controllers in the Dallas site and includes the date and time of the first failure, total failures, last error number, and the replication partner it failed with. The value returned by the LastError parameter is actually a number that can easily be decoded by running the NET HELPMSG command.


2. Get-ADReplicationAttributeMetadata


Get-ADReplicationAttributeMetadata shows the attribute and replication metadata for a specific Active Directory object. For example, to get an object’s replication metadata and attribute status, execute the command below:


Get-ADReplicationAttributeMetadata -Object "CN=Domain Admins,CN=myUsers,DC=mydomain,DC=local" -Server DC1 -ShowAllLinkedValues


The above command shows the replication metadata of the “Domain Admins” object. The ShowAllLinedValues parameter instructs the command to return all linked values if any of the attributes of Domain Admins is multi-valued. This command is very useful if you are troubleshooting replication issues for a particular Active Directory object.


3. Get-ADReplicationPartnerMetadata


In case you need to see the replication metadata for a replication partner, use the Get-ADReplicationPartnerMetadata PowerShell cmdlet as shown in the following command:


Get-ADReplicationPartnerMetadata -target DC1.mydomain.Local


Running the above command will show you the information such as LastChangeUSN, whether the compressions is enabled or not, the last date and time the replication attempt was made, and the last date and time the replication was successful. This is a very useful cmdlet if you need to get a view of the replication status for all domain controllers in the Active Directory forest. For example, the command below helps you retrieve specified metadata for all domain controllers in an AD forest:


Get-ADReplicationPartnerMetadata -Target * -Scope Server | where {$_.LastReplicationResult -ne "0"} | Format-Table Server, LastReplicationAttempt, LastReplicationResult, Partner


4. Get-ADReplicationQueueOperation


The Get-ADReplicationQueueOperation PowerShell cmdlet is useful if you need to know if any replication operations are pending on a specified server.


5. Sync-ADObject


The Sync-ADObject PowerShell cmdlet helps you replicate an Active Directory object to all the domain controllers across an Active Directory forest. The Sync-ADObject cmdlet can be very helpful if you need an object to be replicated immediately regardless of the replication interval. For example, the following command replicates the user “James” to all the domain controllers:


Get-ADDomainController -filter * | ForEach {Sync-ADObject -object "CN=Jack, OU=myUsers, DC=mydomain, DC=Local" -source DC1 -destination $_.hostname}


6. Get-ADReplicationUpToDatenessVectorTable


Using Get-ADReplicationUpToDatenessVectorTable, an Active Directory administrator can list the highest Update Sequence Number (USN) for a specified domain controller. To get the highest USN for a specific domain controller, execute the command below:


Get-ADReplicationUpToDatenessVectorTable -Target DC1.mydomain.local


In case you need to see the highest USN for a specific Active Directory partition, use the -Partition switch as highlighted in the command below:


o  Get-ADReplicationUpToDatenessVectorTable -Target DC1,DC2 -Partition Schema


The above command retrieves the highest USN of the Schema partition for both the NKAD1 and NKAD2 domain controllers.

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