HP Storage Mirroring V5 Software - Manual (Page 44)

34 Protecting an Exchange Cluster with a Like-Named Cluster
8. If you want to modify DNS configuration options, click Configure . The Configure DNS Failover window will
appear.
9. On the Configure DNS window, you can modify the TTL value for the DNS record. You can also specify the
user credentials needed to modify DNS. When you are finished, you can click Test to test the DNS
configuration for the selected DNS server(s), or click OK to return to the Configure Protection window.
NOTE: Decreasing the TTL value will increase the speed at which clients get the updated information.
10. After you have changed the configuration parameters, click OK to apply the settings and return to the
Manage Exchange window. If you click Cancel , any changes you have made will be discarded and the
previous configuration parameters will be used.
11. Click Validate to validate the selected cluster pair. The validation proceeds exactly like validation for other
methods of failover.
12. Click Enable Protection to enable protection for the source cluster.
Enabling protection
After protection is enabled, the Storage Mirroring Application Manager creates four resources on the target
cluster: two generic script resources, an IP address resource, and a temporary name resource. The temporary
name resource is the source EVS name with “_LN” appended to the end. The Application Manager uses the
temporary name resource for the connection between the source and target clusters. The Application Manager
gets the order of the source cluster resources from the Microsoft Cluster DLL, then builds the scripts with the
resources in order and based off the source’s resources configuration.