vgscan not working / ignite not recreating volume groups

I encountered a problem the other day with ignite not recreating the volume groups properly - it was caused by a component of service guard that was stuck on that machine.  For some reason (maybe because serviceguard was once installed on the box), the file /dev/slvmvg (serviceguard file for shared volume groups) also prevented vgscan from working.  Once I removed the file, vgscan created the volume groups without a problem.