Repair local Exchange Database Availability Groups (DAGs) are a core element for the high availability of Exchange servers in the local data center. This applies to Exchange Server 2016, Exchange Server 2019 and most likely also to the successor, which is due to be released in 2025. If a DAG member fails, administrators must restore the databases. This can be done by either using an existing server or by reinstalling the DAG member and then restoring it to the existing environment. DAGs are easier to set up in Exchange 2016/2019. For example, IP addresses no longer need to be reserved and configured for these groups.
Exchange services also play an important role in restoring DAGs and members of a DAG. The Microsoft Exchange DAG Management service controls the administration of mailbox servers and the collaboration with database availability groups. The service must be started on mailbox servers. If it does not work, then the DAG is also disrupted.
Consider licenses when restoring DAGs
If you use database availability groups (DAGs), these can Sudan Phone Number List have 16 members. When using the standard edition of Exchange 2016/2019, however, each server can only provide a maximum of five active or passive database copies. If the enterprise edition is used, up to 100 databases can also be used here. This plays an important role in a recovery process.
Prepare for the restoration of DAGs and DAG members
The path and name of the database can be viewed in cell phone number listing the properties of databases in the Exchange Admin Center via the “General” menu item. If companies use database availability groups, the servers with copies of the database are displayed in the “Servers that host a copy of this database” area. This plays an important role in recovery.
DAGs are also important when using public folders
Even if there is no replica of a public folder on an Exchange server. Users whose mailboxes are on that Exchange server will still be able to see the public folders and use them. Replication in Exchange 2019 is done via database availability groups. Just like with mailbox databases.
When restoring DAGs, virus protection on the server is also important. Care should be taken to ensure that system directories are not scanned by a virus scanner, otherwise performance will be Bulk Database significantly reduce. When restoring a DAG member. The directories are relevant because the malware scanner is often already install and the directories must be remove from the configuration. On servers that are members of a database availability group. The following folders should be exclude from the virus scanner:
Clean up the Active Directory if a DAG member fails
If a DAG member fails. Administrators should first clean up the Active Directory to ensure that no unforeseen errors occur during recovery. The first step is to ensure that no database copy is pointing to the fail server. The easiest way to do this is in the Exchange Management Shell.
