The issue seems to have been sorted out as of Karmic because lvm on top of dmraid works fine. I'm not sure exactly how, but I think udev now only instructs lvm to scan devices that blkid has identified as lvm physical volumes, and blkid gives priority to dmraid signatures first.
The issue seems to have been sorted out as of Karmic because lvm on top of dmraid works fine. I'm not sure exactly how, but I think udev now only instructs lvm to scan devices that blkid has identified as lvm physical volumes, and blkid gives priority to dmraid signatures first.