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Asynchronous I/O Support on OCFS/OCFS2 and Related Settings: filesystemio_options, disk_asynch_io (Doc ID 432854.1)

Last updated on MAY 13, 2021

Applies to:

Linux OS - Version Oracle Linux 4.4 and later
Oracle Cloud Infrastructure - Version N/A and later
Linux x86
Linux x86-64


This article clarify the difference among the  concepts and options about Direct I/O and  Asynchronous I/O and filesystemio_options and disk_asynch_io .


This article will introduce some concepts about I/O on Linux platform, after that, it will focus on the options: filesystemio_options and disk_asynch_io.

The part of introduction of AIO and all the pictures related come from the article  "Boost Application Performance using Asynchronous I/O" authored by M. Tim Jones. As of this document is written (June 7, 2007) no copyright violation of the material is applicable if referenced explicitly.


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In this Document
 1. Introduction to AIO
 2. I/O Models
 3. What do filesystemio_options and disk_asynch_io Do?
 4. O_DIRECT and Async I/O

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