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To move a vCenter to another DSM:

  1. Deactivate the systems in the second manager environment.
  2. Remove the vCenter from the second manager.
  3. Add the vCenter/VSM to the first manager.
  4. Activate the Deep Security Virtual Appliance (DSVA) again.
 
You do not have to prepare the ESX again. The first manager will see them as prepared when it synced up with VC, assuming that the FD and other package version matched between the two managers.