You may be running into this:
http://support.citrix.com/article/CTX123400That article is the reason many people dump Xenserver/Citrix. It's a major pain. I don't know for sure if it exists in 6.02, but you might follow the steps and see if you get your storage back.
-- Regards, Nik Nik Martin VP Business Development Nfina Technologies, Inc. +1.251.243.0043 x1003 Relentless Reliability
