I would suggest opening a support case so that it can be looked at directly. 
Hi, I have PS6500 arrays and updated the firmware to 6.0.7 recently. I want to claim back space on exchange database and log LUNs, the LUNs show reported size the same as reserved size although only a small percentage is being used by the OS. Below is the recommendation from the eqlrethin command. How will I be able to fix the reported size on the array? C:\Program Files\EqualLogic\bin>eqlrethin j:\ -aVolume j:\  File system reports 2.6 GB in use, SAN reports 100.0 GB allocated for this volume.  Rethinning could recover up to 0.0 MB (0%) of storage for this volume.  Rethinning is not recommended.
eqlrethin on windows 2008 R2 with Exchange