If the NFS server has a large number of cores and a fair amount of memory, you can increase RPCNFSDCOUNT. I have seen 256 used on an NFS server with 16 cores and 128GB of memory, and it ran extremely well. Even for home clusters, eight NFS daemons is very small, and you might want to consider increasing the number.
- Allows the file system to be mounted over an existing mount point, making the underlying file system inaccessible. - If specified, this option prevents the NFS client from caching attributes for the mounted directory.