HP Storage Mirroring Software - Manual (Page 731)

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5. Type in your source machine name and click OK. The Insert Source Machine
dialog box will close and the Monitor Settings dialog box will be available for
updating. This is where you configure failover monitoring.
6. Select the source to be monitored by marking the check box to the left of the source
server name in the Names to Monitor tree.
7. By default, Failover Hostname is disabled. This option automatically removes the
host SPN (Service Principle Name) from Active Directory on the source and adds it
to Active Directory on the target. If you are using Active Directory, enable this
option or you may experience problems with failover.
8. Failback Hostname returns the host SPN on the source and target back to their
original settings on failback. If you are using Active Directory, enable this option or
you may experience problems with failback.
9. If you are failing over or failing back hostnames, you need to specify an Active
Directory user that has update privileges within Active Directory. Click Credentials
and identify a user and the associated password that has privileges to create and
delete SPNs. The username must be in the format fully_qualified_domain\user.