EMC is only popular by brand so as Cisco and SUN (maybe you just seen it on your IT Infrastructure). But they are just brands. The openings here are more of a Sales and Marketing with technical experience. You need to be hands-on experience on this equipment not necessary employed with them.
There are brands that can go head-to-head with this
EMC - Hitachi - NetApp, etc.
SUN was brought by Oracle already
Cisco - Juniper - Foundry Networks, etc.