HP Serveur lame HP ProLiant BL465c Gen8 - Manual (Page 58)

Using a cluster configuration
• Do not register the service resources of multiple SQL Server instances into a cluster group.
• In a cluster environment, specify a user on each node for the owner of a database subject to
backup. Local users with the same user name and password on different nodes are not considered
to be the same user. Therefore, use a domain user account that is common to all nodes. If failover
is performed to a node where the database-owner user does not exist, backup fails because the
database owner is unknown.
• In a cluster environment, install an SQL Server instance as a failover cluster.
• In a cluster configuration using Veritas Cluster Server for Windows, the file system that contains
registry replication data should not be backed up by Application Agent. Make sure that you allocate
such a file system to a disk group or physical disk that is not subject to backup.
System configurations for backing up Exchange databases
This section describes system configurations in which Application Agent is used to back up Exchange
databases.
Cascade configurations
When you back up Exchange databases, Application Agent can back up data concurrently at both
the local and remote sites. This type of multi-level backup configuration is called a cascade
configuration.
To back up a volume in a cascade configuration, you need a database server and a backup server
at both the local site and the remote site.
The following figure shows an example of a cascade configuration when Application Agent is used
to back up Exchange databases.
Figure 25 Example of a cascade configuration (when backing up Exchange databases)
CCR configurations
Application Agent supports backup in a CCR configuration. CCR is a high availability function of
Exchange Server 2007, and includes the following features:
• Ability to ship logs (transaction log replication) between active and standby server volumes.
Application Agent system configurations 58