HP Serveur lame HP ProLiant BL465c Gen8 - Manual (Page 65)

Figure 32 Configuration in which a passive mailbox database copy Is backed up and restored
Primary volume 1 is the active mailbox database copy, primary volume 2 is the passive mailbox
database copy, and the secondary volume is managed by the backup server. The active side manages
services, and the passive side takes over execution of the active side's services if needed and also
performs backup and restore operations. The data synchronization between the active side and the
passive side is accomplished via log shipping. On the passive side, data is backed up from primary
volume 2 to the secondary volume, and then the data on the secondary volume is stored on a tape
device.
If an error occurs on the active side, the passive side takes over the execution of services. After the
active side recovers from the error, seed processing is performed from the passive side, so that the
data that was updated while the passive side was executing the services is applied to the active side.
If an error occurs on the passive side, seed processing is performed from the active side, so that the
data on the passive side is restored. You cannot perform any backup or restore operations until the
passive side has been recovered from the error.
If logical errors, such as those caused by viruses, occur on both the active side and the passive side,
the data is restored from the tape device to the secondary volume, and then from the secondary
volume to primary volume 2. The restored data is then applied to primary volume 1 via seed processing.
Backing up and restoring the active mailbox database copy and the passive mailbox database
copy by using different backup servers
The following figure shows an example of a DAG configuration in which an active mailbox database
copy and a passive mailbox database copy are backed up and restored by different backup servers.
Application Agent CLI User Guide 65