 NDMP isn't supported by the array itself.  The array is block storage, NDMP requires access to the filesystem.  The host connecting to the storage would have to support NDMP.  With a FS7500 you could do that.  You would have to create NFS based datastores and migrate all the VMs there.   Have they looked at existing backup software for VMFS datastores?    Since the backup software has to support NDMP anyways.  
Hi Team, One of my existing customer is looking forward to use NDMP to backup the volumes and vsphere datastores both exists on Dell Eql PS4000 array.  a) How can we use NDMP with EQL? b) What are the components required to enable this functionality for do i need FS7500 or any backup software? c)  Procedure and configuration of enabling NDMP with EQL? Please advice possible options.  Thanks
Using NDMP to backup volumes on Dell EQL PS4000 array