Question, are you using VSM to take the initial snapshot?    If so, does the same thing happen if you create a snapshot at the Group Manager instead? 
Hi, i just decided to built this case in my testlab, it seems extremely interesting to me. Somebody here in the group any idea what that could be or ever heard of such a case? [URL] Background / Idea: Any LUN-accessor should never ever see even the slightest difference between a lun as such and the same lun with unexposed snapshots. This should be absolutely and completely transparent to everything - the host, the initiator and the cbt engine. The only exception would be tools or plugins which especially take use of deeply integrated san-snapshot features. Best regards,Joerg    
extremely interesting and urgent - possible difference in appearance of LUNs 
with and without unexposed snapshots to the initiator