NFSv4.1 server support for pNFS SCSI layouts

configname: CONFIG_NFSD_SCSILAYOUT

Linux Kernel Configuration
└─>File systems
└─>Network File Systems
└─>NFSv4.1 server support for pNFS SCSI layouts
In linux kernel since version 4.1 (release Date: 2015-06-21)  
This option enables support for the exporting pNFS SCSI layouts
in the kernel's NFS server. The pNFS SCSI layout enables NFS
clients to directly perform I/O to SCSI devices accesible to both
the server and the clients. See draft-ietf-nfsv4-scsi-layout for
more details.

If unsure, say N.