Put your DAG into Maintenance


You install Exchange Cumulative Updates as soon as they arrive, right? You do your daily job while maintaining Mailboxes and Distribution Groups?.
Now it is time to get in touch with the upgrade-process. While you know the details about PAM/SAM from my other blog posts we can directly head over to installing your next Exchange Cumulative Update.

Important things to note prior the upgrade:

  • Disable the OS Anti Virus Engine
  • Disable/Stop Backup Jobs or Windows Services with Active Connections to Exchange
  • Check your AD Backup with repadmin /showbackup
  • Check your Database Backup with Get-Mailboxdatabase -Status | fl Name,*backup*
  • The the above output for “Backup in Progress” Messages.
  • You use a loadbalancer? The the “Real Server” into Maintenance/Disable the Server on the Loadbalancer for new connections
  • You use DNS Round-Robin? Remove the DNS record for the node you want to patch
  • Be aware for some “Relay” DNS records where SMTP devices will send messages.
  • You use Microsoft Operations Manager (SCOM)? or any other monitoring solution? Put your Server into Maintenance!
So now we can start over, right?
Not yet buddy! First we need to set the PowerShell Execution Policy to unrestricted
Set-ExecutionPolicy unrestricted
If your Server do not have Internet Access please disable the option “Check for publisher’s certificat revocation”. This will save you hours of waiting.

Now lets get started with the fun – ready for copy and paste into your environment:

#Define the Server to update
#Define the Server where to move the databases
#Define the DAG Name
 #Set the components into maintenance
Set-ServerComponentState $SERVERNAME –Component HubTransport –State Draining –Requester Maintenance
#Redirect all Messages to the server available during maintenance
Redirect-Message -Server $SERVERNAME -Target $ServerToSwitch
Move-ClusterGroup –cluster $DAGName –name "Cluster Group" –node:$ServerToSwitch
#Suspend the cluster Node
Suspend-ClusterNode –Name $SERVERNAME
#Do not allow to mount databases (PAM and BSCC disabled)
Set-MailboxServer $SERVERNAME –DatabaseCopyActivationDisabledAndMoveNow $true
Set-MailboxServer $SERVERNAME –DatabaseCopyAutoActivationPolicy Blocked
#Set Server Wide Offline for all Components
Set-ServerComponentState $SERVERNAME –Component ServerWideOffline –State InActive –Requester Maintenance
#Move all active Databases to the defined node.

Move-ActiveMailboxDatabase -Server $SERVERNAME -ActivateOnServer $ServerToSwitch

Your EXGuru – aka Peter Forster – aka Satschent Peter

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