Considering Oracle bought part of the "RAC Technology" from Compaq/Digital (Tru64).... ... well, not really. Oracle licensed the clusterware (http://www.hp.com/hpinfo/newsroom/press/2001pmc/pr2001022701.html), but that is really just node membership services when you boil it down. RAC is an internal feature of the server that relies on a library (libskgxn.so) for node membership services... -- //www.freelists.org/webpage/oracle-l