Primary Site Failure and Backup Site Activation
Activation of the Disaster Recovery site begins withverification of directory services and DNS resolution. Because the DR siteshould already contain a directory server that is also hosting Active Directory-integratedDNS, these services should be healthy, current, and largely unaffected by theoutage of the production site.
There are three basic steps that you complete toperform a data centre switchover, after making the initial decision to activatethe second data centre:
These steps are described in more detail in the following Terminate a partially running datacenter
If any DAG members in the failed datacenter are stillrunning, they should be terminated. When the DAG is in DAC mode, the specificactions to terminate any surviving DAG members in the primary datacenter are asfollows:
Stop-DatabaseAvailabilityGroup–Identity DAG –MailboxServer MBX SERVER NAME 1
Stop-DatabaseAvailabilityGroup–Identity DAG –MailboxServer MBX SERVER NAME 2
Stop-DatabaseAvailabilityGroup–Identity DAG –MailboxServer MBX SERVER NAME 1 -ConfigurationOnly
Stop-DatabaseAvailabilityGroup–Identity DAG –MailboxServer MBX SERVER NAME 2 -ConfigurationOnly
Stop-DatabaseAvailabilityGroup–Identity DAG – ActiveDirectorySite SITE-A -ConfigurationOnly
1.1.2 Activating Mailbox Servers
When the DAG is in DAC mode, the steps to completeactivation of the mailbox servers in the second datacenter are as follows:
Restore-DatabaseAvailabilityGroup–Identity DAG –ActiveDirectorySite EXCH-DR
Set-MailboxServer–Identity MBX SERVER NAME –DatabaseCopyAutoActivationPolicy Unrestricted
Get-MailboxDatabase| Move-ActiveMailboxDatabase -ActivateOnServer MBX SERVER NAME
Verify that all databases are mounted.