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SubjectRe: Asking about Unbuffer I/O in linux
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> I met a problem which need me to use unbuffered I/O in linux.  The problem
> is related to hard disk I/O.
> When I read from the Linux buffer cache, the other system may write new
> data to the hard disk, while
> the Linux buffer cache doesnot know it. So I try to find if there are some
> methods to disable the buffer

Stephen Tweedie did some 2.2.x patches to allow you to do direct uncached
I/O to and from the media. The typical application for this being things like
clustered database with shared disk.

If you want to do this with a file system not raw disk however you will need
to do a lot more work. File systems don't expect multiple writer machines -
although a project called GFS is working on a fibrechannel based fs that
does


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