Actually, if you didn't want to pay for ServiceGuard, you could use CRS alone for either case: active-active (RAC), or active-passive. I'm not sure why you'd use SG+CRS if you're doing active/passive, since SG is by itself a perfectly respectable HA active/passive clustering solution. Thanks, Matt -- Matthew Zito Chief Scientist GridApp Systems P: 646-452-4090 mzito@xxxxxxxxxxx http://www.gridapp.com -----Original Message----- From: oracle-l-bounce@xxxxxxxxxxxxx on behalf of D'Hooge Freek Sent: Fri 1/23/2009 6:20 AM To: sxmte@xxxxxxxxxxxxxxxx; oracle-l@xxxxxxxxxxxxx Subject: RE: Thoughts on crs installation on HP-UX Maureen, If you are talking about active-passive clustering, then you don't need crs (don't even think you can use it). If you are talking about active-active clustering then you need rac (and thus crs). Regards, Freek D'Hooge Uptime Oracle Database Administrator email: freek.dhooge@xxxxxxxxx tel +32(0)3 451 23 82 http://www.uptime.be -- //www.freelists.org/webpage/oracle-l