NFSv4 support is already compiled into the CentOS kernel so no extra installation is necessary. To force NFSv4 on the server set the following options in /etc/sysconfig/nfs:

a) MOUNTD_NFS_V2=”no”

b) MOUNTD_NFS_V3=”no”

c) RPCNFSDARGS=”-N 2 –N 3”

Dan