HP StorageWorks Storage Mirroring Recover User's Guide (T5437-96008, November 2009)

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The following topics explain how to configure the options on the Failover tab:
Failover type
DNS failover
Identity failover
Failover Type indicates what name resolution method will be used to redirect users to
the target Exchange server in the event of a source failure. By default, DNS Failover is
selected.
Note: For clustered environments, only DNS failover is supported.
DNS failover
DNS Failover is the recommended method for failover. Use this option if you want to
failover by updating the DNS records associated with the source. This will modify all
source server A, MX, and PTR-type DNS resource records to point to the target.
In DNS Failover, the DNS records for the source server are modified to point to the target
server’s IP address. This allows clients to resolve the source Exchange server name to
the target server’s network name and IP address at failover time. DNS Failover
eliminates duplicate server name and IP addresses on your network.
After you select the DNS Failover option, click Configure. The Configure DNS Failover
window will appear.