Too many small NAS Luns?

Hi all,

I just inherited a VNX 5600 storage system at my new job that serves double duty of Block and File/NAS storage. It seems the storage admin before me thought it was a good idea to carve 1TB luns out for the celerra/NAS.  Looks like its currently taking up ~90x 1TB luns.  I think this is a terrible use of storage controller bandwidth and I would like to replace or migrate that to much larger  (4 or 8TB) luns and have way fewer of them.

I guess my question is there any intelligent way to accomplish this without migrating all the data to an alternate location or storage pool?  I already found that I am unable to simply expand the luns that already exist in the ~filesystem storage group.