HP Storage Mirroring V4.5 Software - Manual (Page 45)

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6. On the Manage Exchange window, click Configure to open the Configure Protection window,
then select the Failover tab.
7. DNS Failover is the only option available for configuring protection with like-named clusters.
For more information about DNS failover, see DNS failover on page 3-5.
8. If you want to modify DNS configuration options, click Configure. The Configure DNS Failover
window will appear.