Hello Guys! I am a newbie to clustering. I have a couple of questions. The scenario is: 2 radius servers that receive auth and acc from internet, and the ms sql database where these 2 radius write and read information to. I am planning to build a sql cluster with active/pasive config for the only one database. I just bought 2 dell 2650 servers and a scsi storage. The OS will be Windows 2000 Advanced Server on all of the machines. I read the documentation about installing windows 2000 clustering services and it says itÂ´s recommended to configure the nodes in the cluster as members of a domain, not (if possible) domain controllers. Do I have to configure Primary Domain Controller (PDC) and Backup Domain Controller (BDC) or Active Directory? What is your recomendation ? to install the PDC or Active directory in the nodes of the cluster or in the radius servers? If Active Directory is the choice is it posible to install 2 Active Directory servers for redundancy ? thanks a lot, Pablo.