How to Upgrade DAG Members In Exchange Server 2010 Part-1

 

Lets now get our selves well versed in upgrading the DAG nodes. In this post we will see how to upgrade the DAG nodes from exchange 2010 sp1 to Exchange 2010 sp2

 

For this post i would consider that i have 2 member DAG named Node 1 and Node 2. The DAG name is DAG1. l

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Fig 1: The above figure shows that Exchange version of the 2 nodes to be SP1

 

Now lets see how the DAG is configured

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Fig2: The above figure shows the DAG names and the members of the DAG

 

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Fig 3: Shows how the databases are distributed across each nodes

Before we see how to upgrade lets see what are the permissions that are required for the User who is doing this task

 

Feature Permissions required
Database availability group membership Organization Management

Database Availability Groups Role

Database availability group properties Organization Management

Database Availability Groups Role

Database availability groups Organization Management

Database Availability Groups Role

Database availability networks Organization Management

Database Availability Groups Role

Fig:4 Shows the permission that are required for managing DAG

StartDagServerMaintenance.ps1

How does the above script help us in upgrading the DAG members?

It performs the below tasks .

  1. Runs Suspend-MailboxDatabaseCopy with the ActivationOnly parameter to suspend each database copy hosted on the DAG member for activation.
  2. Pauses the node in the cluster, which prevents the node from being and becoming the PAM.
  3. Sets the value of the DatabaseCopyAutoActivationPolicy parameter on the DAG member to Blocked.
  4. Moves all active databases currently hosted on the DAG member to other DAG members.
  5. If the DAG member currently owns the default cluster group, the script moves the default cluster group (and therefore the PAM role) to another DAG member.

Lets see how the Script and the DAG members are upgraded to Sp2 in the next post

Happy Learning.

Regards,

Chris.

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