HP Storage Mirroring Software - Manual (Page 165)

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IP Address (to create)—Enter a new IP address for the target to use when it
stands in for the source.
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Subnet Mask—Enter the subnet mask to use for the new IP address.
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Storage Resources—The Application Manager will automatically select the
required storage resources on the target, provided that they exist (for
example, if the source and target both have E:\ and S:\). Verify that the drive
letters where Exchange data is located are selected.
Note:
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You can not de-select a storage resource that exists on both the source
and target.
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If the drive letters on the source and target do not match, then not all
required data will be selected automatically. You will need to select it
manually. The selected storage resources must be in the same group.
5. When you are finished, click OK to return to the Manage Exchange window.
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 .