Which write consistency model does NFS use?

NFS adheres to a stateless-server model and uses a probabilistic, stateless consistency scheme’.

What is NFS caching?

In NFS, data caching means not having to send an RPC request over the network to a server: the data is cached on the NFS client and can be read out of local memory instead of from a remote disk.

How reliable is NFS?

In short, the NFS protocol and the NFS client implementation of it are very reliable.

What is open after close consistency?

The only consistency guarantee made by NFS is called close-to-open consistency, which means that any changes made by you are flushed to the server on closing the file, and a cache revalidation occurs when you re-open it.

Is NFS clear text?

NFS clients and servers push file traffic over clear-text connections in the default configuration, which is incompatible with sensitive data. TLS can wrap this traffic, finally bringing protocol security.

Does NFS have cache?

NFS indexes cache contents using NFS file handle, not the file name; this means that hard-linked files share the cache correctly. Caching is supported in version 2, 3, and 4 of NFS. However, each version uses different branches for caching.

How can I improve my NFS performance?

Start plenty of NFS daemon threads.

1. If read dominates, add RAM on the clients to cache more of the file systems and reduce read operations.
2. If write dominates, make sure the clients are using noatime,nodiratime to avoid updating access times.
3. If getattr dominates, tune the attribute caches.

Who invented NFS?

Sun Microsystems
Network File System (NFS) is a distributed file system protocol originally developed by Sun Microsystems (Sun) in 1984, allowing a user on a client computer to access files over a computer network much like local storage is accessed.