Thanks, I've already checked through the EqualLogic PS6500 that I am using....there does seem to be a consistency problem with the Shelf, I'm gathering logs for submission to the Engineers right now.
However this seems to be a relatively new issue as I was not encountering it when I initially created the first set of LUNS for vm's I was working with and did not encounter that issue then. IT was only when I performed the task again later that I started to encounter.