next generation of NFS version supported by vSphere 6.0
Brief info:
•Kerberos
5 Authentication. Non-root access. If Kerberos is
not used then access will be AUTH_SYS or root credentials.
•Multipathing
and Availability using Session Trunking requires storage array configuration by exporting multiple IP addresses with the
NFS export.
•Compound RPC operations states that more RPC operations can be transmitted in a
single communication to the array thereby increasing efficiency and
reducing chattiness from NFSv3. Chattiness
refers to NFSv3 sending an acknowledgement for each packet sent.
•Error
Recovery – Client and server not state-less
anymore. Fore Channel (client side) & Back Channel (server side)
functionality.
•Single
Protocol – No side-band lock or mount protocol.
For NFSv3 the file system operations that include file locking was handled by
the VMKernel.
NFSv41 exports mounted on the ESXi server will be protocol driven. The rfc is
an excellent resource for how file locking, error recovery, session trunking
and multipathing are handled.
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