NFSv4 pNFS Extensions
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This Internet-Draft provides a description of the pNFS extension for
NFSv4. The key feature of the protocol extension is the ability for
clients to perform read and write operations that go directly from the
client to individual storage system elements without funneling all
such accesses through a single file server. Of course, the file server
must provide sufficient coordination of the client I/O so that the
file system retains its integrity. The extension adds operations that
query and manage layout information that allows parallel I/O between
clients and storage system elements. The layouts are managed in a
similar way to delegations in that they are associated with leases and
can be recalled by the server, but layout information is independent
of delegations.