HP B6960-96035 - Manual (Page 272)

remote disaster recovery site using hardware mirror concepts is widely accepted in
the industry.
Local/remote mirror combination
If the customer has a need for a permanently available recovery site (provided, for
example, by a MetroCluster) in addition to a zero downtime backup solution, the
combination of a remote mirror and a local mirror can be used.
This solution allows for full split mirror advantage together with a full recovery solution
at the remote site. In this example, the remote mirror is constantly maintained with
only the local link split for backup purposes. This gives the cluster the continuous
ability to fail over to the remote site (site B).
Figure 81 Local/remote mirror combination (disaster recovery
integrated backup [Service HA - HP-UX only])
In order to have the failover functionality independent of the backup operation, the
backup client must be a separate additional client outside the cluster. If a MetroCluster
solution is implemented, the cluster arbitration client could be the backup client.
Split mirror concepts 272