I would like to mount an NFS share to an EMC array enlarging it's capacity until we can expand the EMC environment. I have a cheap Synology with 12TB of storage I would like to use to expand it for a short time. Is this possible?
Don't entertain this idea. If you need to expand the capacity of your EMC array (please specify the type), go through the proper channels and work with EMC on the possible upgrade paths. Running out of space wasn't a surprise, was it?
If you wish to use the Synology NAS as additional space, just use it as a standalone device; another tier of storage. The EMC will not be able to address the Synology in any meaningful way.
No. You need a DAE from EMC to add more drives to a Clariion or VNX.