NFSv4.1 server support for Parallel NFS (pNFS)

configname: CONFIG_NFSD_PNFS

Linux Kernel Configuration
└─>File systems
└─>Network File Systems
└─>NFSv4.1 server support for Parallel NFS (pNFS)
In linux kernel since version 4 (release Date: 2015-04-12)  
This option enables support for the parallel NFS features of the
minor version 1 of the NFSv4 protocol (RFC5661) in the kernel's NFS
server.

If unsure, say N.