all, according to ML Note:220970.1 that whether use OS cluster or not, we must install oracle clusterware for 10g RAC. what I need other information are: 1 . is it same the behavior between 10g rac which use OS cluster and by purely oracle clusterware ? I mean the node eviction behavior.... 2. DO I need OCR and voting disk?? 3. is it network heartbeat (private network) still mandatory? and should use ethernet?? thanks for your sharing............. -- regards ujang jakarta - indonesia http://ujang-id.blogspot.com -- //www.freelists.org/webpage/oracle-l