What FLARE Release are you running?  There is an issue with FLARE 29.  See KB Solution emc229869.  If you cannot access the solution online, contact EMC Support and cite the solution ID.  
HI all.  Two weeks ago I've started a defrag on a raidgroup, but today it's still at 0% The raid group is defragmenting the raid group is transitioning Expansion/Defrag priority  -> Medium  On this RG I've placed 1 prodution Lun and 2 secondary MV/s LUNs. The RG %utilization il low.   Thanks  Matteo
Defrag doesn't start