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<!-- Copyright (C) The IETF Trust (2011-2012) -->
<!-- Copyright (C) The Internet Society (2011-2012) -->
<section anchor='sec:ioadvise' title='Support for Application IO Hints'>
<t>
Applications can issue client I/O hints via
posix_fadvise() <xref target="ref:posix_fadvise" /> to the NFS client.
While this can help the NFS
client optimize I/O and caching for a file, it does not allow the NFS
server and its exported file system to do likewise.
We add an IO_ADVISE procedure (<xref target='sec:io_advise' />) to communicate the
client file access patterns to the NFS server.
The NFS server upon
receiving a IO_ADVISE operation MAY choose to alter its I/O and
caching behavior, but is under no obligation to do so.
</t>
<t>
Application specific NFS clients such as those used by hypervisors
and databases can also leverage application hints to communicate
their specialized requirements.
</t>
</section>
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