Which enginuity version you have? I believe DMX does not support data-at-rest encryption (DARE) but support data-at-flight (Drive Erasure). Below documents describe some security configuration via solutions enabler. I can't find earlier version guide, but the concept in documents could be refered  P7, Security [URL]  Symmetrix Security Configuration Guide [URL]
we have a dmx-4 1500 disk array, now we want to encrypt the data stored in the dmx-4.  thanks.
does dmx-4 support data encryption?