If a NFS client reads a file, does any network traffic happen? or is it just writes (by any node) that result in network traffic?
In particular, I'm interested in whether doing a
file_exists() call in a PHP script will be more expensive if the target file is on NFS than if the target file is on the native file system?
For reference, this is my NFS configuration:
192.168.0.1:/var/www/staging/uploads /var/www/staging/uploads nfs soft,intr,rsize=8192,wsize=8192