A customer has two identically configured Linux hosts (OS version, memory, CPU) attached to the
same network. One host is NFS-attached and the other is FC-attached to an EMC VNX. Both the
NFS file systems and the SAN LUNs are created from four RAID 5 (4+1) RAID groups. LUNs are
not shared between file and block.
The customer reports NFS-attached host is able to achieve much greater throughput via NFSv4
versus the FC-attached host.
What is the source of the performance difference between the file and block configurations?

A.
FC encapsulation overhead

B.
I/O size

C.
Host Patch levels

D.
NFS version