Hello folks,
During the OCS Forest preparation we have the option to choose where we are going to store the OCS Global Configuration (as shown in the figure below). Andrew Sniderman (http://communicationsserverteam.com/articles/142.aspx) blogged some tips to help you to decide which is the best solution for your deployment.
His post can be found at http://communicationsserverteam.com/archive/2008/04/18/152.aspx
Best Regards,
Anderson Patricio