Sounds like something you need to ask Double Take. If this is a true "High Availability" cluster, Double Take should recognize that the primary server is off line and take the appropriate actions. I don't know what actions you are required to take. We use a program called Life Keeper by Steeleye for our Exchange 5.5 High Availability cluster. When the primary server fails over, the backup machine automatically detects that the primary is off line and takes on the IP address and server name that Exchange uses and then starts the required services. While the primary server is on line, the data drive is mirrored constantly from the primary to the backup. From the time that the primary goes off line to the time that the backup is on line is less than 10 minutes.
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