You can unregister the EQL VSS writer.   When Volume Shadow Service is asked to quiet a disk, it uses the writer to determine who owns that disk.   finding the EQL writer it will ask the array to take a HW snapshot.    You can unregister the writer at the CLI.   I believe the command is in the admin guide.  If you aren't planning on using snapshots,that would be the best option.  
I have a PS6100XV connected to my brand new 4 Processor 64 Core virtual host.  Was super excited to be live migrating my VMs to this new server until I tried to back them up.  I wasted hours trying to figure out why DPM 2012 could not do a backup.  I finally realized if I gave the volume some snapshot space in the Equallogic backups work fine.  My question is this: What is the benefit of using the Equallogic's VSS writer? Can I turn off VSS and just have DPM use the one built into the OS? What would you recommend for the most reliable solution?
DPM Hyper-V backups fail until I allocate snapshot space in PS6100XV