Re: xfs_fsr, performance related tweaks

[David Chinner <dgc@xxxxxxx>]

On Fri, Jun 29, 2007 at 07:41:15AM +0100, Just Marc wrote:
> Barry Naujok wrote:
> >You can use the xfs_io chattr command to mark known files as
> >nodefrag. Using the chattr -R option can be used to recurse
> >directories.
> 
> That's right but I can't do this on a filesystem that's just been 
> defragged say a minute ago, and in the mean time 20 new files got added 
> (I don't know what these files are... ).

So walk the filesystem with a script that queries the number of
extents in each file, and if they have a single extent then
run the xfs_io on them.

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group