A customer has an existing SAN environment. The customer wants to add NAS to share the
storage space. Which solution is most appropriate?
A. Gateway NAS

B.
Scale-out NAS

C.
FCoE SAN

D.
IP SAN

Explanation:
NAS Implementation – Gateway NAS
A gateway NAS device consists of one or more NAS heads and uses external and independently
managed storage. Similar to unified NAS, the storage is shared with other applications that uses
block-level I/O. Management functions in this type of solution are more complex than those in a
unified NAS environment because there are separate administrative tasks for the NAS head and
the storage. A gateway solution can use the FC infrastructure, such as switches and directors for
accessing SAN-attached storage arrays or direct-attached storage arrays.
The gateway NAS is more scalable compared to unified NAS because NAS heads and storage
arrays can be independently scaled up when required. For example, NAS heads can be added to
scale up the NAS device performance. When the storage limit is reached, it can scale up, adding
capacity on the SAN, independent of NAS heads. Similar to a unified NAS, a gateway NAS also
enables high utilization of storage capacity by sharing it with the SAN environment.
EMC E10-001 Student Resource Guide. Module 7: Network-Attached Storage (NAS)