There are a few interesting differences between NFSv3 and NFSv4. Comparison of NFSv3 and NFSv4 is quite hard to obtain and the information is referenced from NFS Version 4 Open Source Project.
According to me the major difference lies in the points below: NFSv3 1. Exports: All exports are mounted separately. Protocol: Numerous protocols for different aspects collected together.
Information for NFS version 3 and version 4 protocols with proto=tcp can be found on the mount man page on a UNIX client. The NFS client automatically selects the proto=tcp option, unless the end-user overrides the option.
NFS Version Upgrades. VSphere does not support automatic datastore conversions from NFS version 3 to NFS 4.1. If you want to upgrade your NFS 3 datastore, the following options are available: You can create a new NFS 4.1 datastore, and then use Storage vMotion to migrate virtual machines from the old datastore to the new one. .Version 3 of NFS started to support files that are larger than 2 gb.It was version 3 which started a performance option of async, which we saw earlier, to improve performance.NFS version 4 was made for better and ease of access over the internet.
In NFSv3, client must rely on auxiliary protocol, the mount protocol to request a list of server’s exports and obtain root filehandle of a given export. It is fed into the NFS protocol proper once the root filehandle is obtained.
In NFSv4 uses the virtual file system to present the server’s export and associated root filehandles to the client.
NFSv4 defines a special operation to retrieve the Root filehandle and the NFS Server presents the appearance to the client that each export is just a directory in the pseudofs
NFSv4 Pseudo File System is supposed to provide maximum flexibility. Exports Pathname on servers can be changed transparently to clients.
State
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NFSv3 is stateless. In other words if the server reboots, the clients can pick up where it left off. No state has been lost.
NFSv3 is typically used with NLM, an auxiliary protocol for file locking. NLM is stateful that the server LOCKD keeps track of locks.
In NFSv4, locking operations are part of the protocol
NFSv4 servers keep track of open files and delegations
Nfs Version 3 Vs Version 4
Blocking Locks
They all can be protected under U.S.
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Nfs Version 3 Vs 4 Series
NFSv3 rely on NLM. Basically, Client process is put to “sleep”. When a callback is received from the server, client process is granted the lock.
For NFSv4, the client to put to sleep, but will poll the server periodically for the lock.
The benefits of the mechanism is that there is one-way reachability from client to server. But it may be less efficient.