You can use it either as active/passive failover with Oracle single-instance, or there's a slightly different version that you can use as RAC clusterware - you still use the CRS, but it recognizes the VCS and just kind of acts as a pass-through. Many many people all over the world use VCS in single-instance environments - for RAC with 10g is much more rare. Matt ________________________________ From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of ryan_gaffuri@xxxxxxxxxxx Sent: Friday, September 07, 2007 10:02 AM To: oracle-l@xxxxxxxxxxxxx Subject: Veritas Clusterware Does anyone use this? Is this something you use with RAC?