Your customer has an existing Isilon cluster with seven X200 nodes. The cluster is used to store
home directories and departmental shared folders. They are planning to deploy a new application
that generates small block, synchronous writes.
Which OneFS 7 capability can help reduce latency for the new workload?

A.
Endurant Cache

B.
L2 Cache

C.
Solid State Drives

D.
Prefetcher

Explanation:
http://isilonblog.emc.com/diving-deeper-into-isilon-onefs-7-0/ (performance, third para)