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https://issues.apache.org/jira/browse/LUCENE-2787?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12965700#action_12965700
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Robert Muir commented on LUCENE-2787:
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Also simon, i just wanted to say, you need to be root to change the mount
option etc.
I think this is totally appropriate for us to do, again quoting from the page:
"This flag is intended for use by *indexing* or backup programs, where its use
can significantly reduce the amount of disk activity."
> disable atime for DirectIOLinuxDirectory
> ----------------------------------------
>
> Key: LUCENE-2787
> URL: https://issues.apache.org/jira/browse/LUCENE-2787
> Project: Lucene - Java
> Issue Type: Improvement
> Components: contrib/*
> Reporter: Robert Muir
> Fix For: 3.1, 4.0
>
> Attachments: LUCENE-2787.patch
>
>
> In Linux's open():
> O_NOATIME
> (Since Linux 2.6.8) Do not update the file last access time (st_atime in
> the inode) when the file is read(2). This flag is intended for use by
> indexing or backup programs, where its use can significantly reduce the
> amount of disk activity. This flag may not be effective on all filesystems.
> One example is NFS, where the server maintains the access time.
> So we should do this in our linux-specific DirectIOLinuxDirectory.
> Separately (offtopic), it would be better if this was a LinuxDirectory that
> only uses O_DIRECT when it should :)
> It would be nice to think about an optional modules/native for common
> platforms similar to what tomcat provides
> Its easier to test directories like this now (-Dtests.directory)...
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