Backup status for Exchange Database Availability Groups (DAGs) and the preferred server list
In an Exchange Database Availability Groups (DAG) environment, NetBackup tracks the success or failure of a backup attempt for each passive copy database backup. This information is stored in the Backup Status database on the NetBackup master server. This status is used in subsequent backup attempts for each database in a DAG. It helps determine from which Exchange node to perform a passive copy database backup.
NetBackup chooses a server from the preferred server list for a subsequent passive copy database backup attempt as follows:
If the last backup was successful and the last backup server exists in the preferred server list... | NetBackup uses that same server. | |
If the last backup was successful but the last backup server does not exist in the preferred server list... | NetBackup chooses a server from the list based on the order they appear. | |
If the last backup attempt failed... | NetBackup chooses a server from the list based on the order they appear. The last failed server is effectively pushed to the bottom of the list. | |
If no backup status exists for a database... | NetBackup chooses a server from the list based on the order they appear. | |
If no backup status exists for a database and if the preferred server list is not configured or if no servers in the preferred server list are relevant for an Exchange database... | NetBackup ranks the health of the passive copies of a database to determine the server. |
To have NetBackup use a particular server for the subsequent passive copy database backup attempt, change the backup status for the database. Indicate that the last successful backup came from the desired server with the following command:
bpclient -client DAG_Name -update -exdb database_name:server_name:0:0:0