use of atime

http://beta.linuxfoundation.org/news-media/blogs/browse/2...
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Alternatively, you can use chattr +A to set the noatime flag on all files and directories where you don’t want noatime semantics, and then clear the flag for the Unix mbox files where you care about the atime updates. Since the noatime flag is inherited by default, you can get this behaviour by setting running chattr +A /mntpt right after the filesystem is first created and mounted; all files and directories created in that file system will have the noatime file inherited.
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