No, EMC has range of Storage Product. There are other Products where Operating System is different,
EMC Celerra: DART
EMC CLARiiON: FLARE
EMC VNX: FLARE
EMC Symmetrix Enginuity Operating Environment etc.
For more information on range of Storage Products offered by EMC refer to: http://www.emc.com/storage/index.htm?nav=1#Featured-Products and the relevant Product Documentation.
I have already mentioned Operation System for most of the Storage Product. I am not sure how to make it more clear.
Please, refer to link mentioned and the product documentation.