The "noac" option is a client side option available that disables attribute caching. For a write to be returned back to the application as complete, all data and filesystem metadata must have hit the ...The "noac" option is a client side option available that disables attribute caching. For a write to be returned back to the application as complete, all data and filesystem metadata must have hit the NFS server. The "actimeo=0" option does turn attribute caching off, however IO is still done asynchronously to the VFS layer, and the dirty page flush daemons on the client handle writing data out to the NFS server at a later time.
