Re: xfs_fsr, performance related tweaks

[Just Marc <marc@xxxxxxxxx>]

David,

In my first post I already said something like that can be done but it's 
just an ugly hack.   Don't you think it would best be handled cleanly 
and correctly by fsr itself?


David Chinner wrote:
> 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.
>