Veritas volume manager & OnLine

Greetings! I am hoping that someone out there has some experiences to share regarding the use of the Veritas volume manager on a Sparc storage array with OnLine 7.1. The use of the volume manager has several big advantages from an administrative standpoint. I'm in the process of getting things set up and am about to begin some experiments of my own. I'm wondering if Veritas obscures information from OnLine regarding the physical devices the data is placed on to the point where the effectiveness of PDQ is greatly reduced. In other words, will OnLine realize that a number of logical volumes (mainly simple, non-striped ones) are actually from separate physical devices so that the appropriate number of threads are created for parallel queries? Is it better from a performance standpoint to let OnLine manage the disks and forget about using a volume manager? Any and all wisdom greatly appreciated. Thanks, Mike Michael Loftus mloftus@interramp.com