NFS

Server

apt install nfs-kernel-server

vi /etc/exports
    /data *(rw,no_root_squash,no_subtree_check)

exportfs -a
systemctl restart nfs-kernel-server

NFS performance monitoring and tuning

https://www.ibm.com/support/knowledgecenter/en/ssw_aix_71/com.ibm.aix.performance/nfs_perf_mon_tun.htm
http://www.nfsv4bat.org/Documents/ConnectAThon/2013/NewGenerationofTesting-v2.pdf

client

apt install -y nfs-common

mount.nfs nfs_server:/dir /dir 
mount -tnfs4 -ominorversion=1 server_nfs_4.1:/dir
mount -t nfs -o nfsvers=4.1 192.168.4.12:/2T 2T
mount -v 192.168.88.10:/ /data/  # mount NFS 4.2

umount --force /PATH/OF/BUSY-NFS(NETWORK-FILE-SYSTEM)

# /etc/fstab
NFS_server:/    /data nfs rsize=8192,wsize=8192,timeo=14,intr