We're running 10.2.0.2 on AIX 5.3 with LPARs and my Unix admins threw in a few extra tenths of a CPU in our production environment without even giving me any advanced notice, which I wasn't too happy about considering we hadn't even tested it, but Oracle seemed to handle it without any problems and cpu_count magically went up from 8 to 10. Honestly, I'm not even sure how many tenths of physical CPUs I'm running on. All I know is what it looks like according to topas, vmstat, sar and Oracle, which are all in agreement that there were 8, and are now 10, virtual/logical CPUs, but I don't really know exactly how it's configured behind the scenes other than that there are really only 4 multi-core CPUs in the box. My Unix admins like to keep me in the dark as much as possible so I don't ask too many questions. You'll notice when you run the AIX 5.3 performance utilities there are metrics called ent and entc% or something like that - can't remember for sure off the top of my head, but these represent the number of virtual CPUs your LPAR is entitled to, and the % of your entitlement you are consuming. Regards, Brandon Privileged/Confidential Information may be contained in this message or attachments hereto. Please advise immediately if you or your employer do not consent to Internet email for messages of this kind. Opinions, conclusions and other information in this message that do not relate to the official business of this company shall be understood as neither given nor endorsed by it.