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 -
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.
272 | Split mirror concepts |