* Ralf Hildebrandt <Ralf.Hildebrandt@xxxxxxxxxx>:
> * Andreas Dilger <adilger@xxxxxxxxx>:
>
> > In ext3/4 the top-level inodes are spread around the filesystem, on the
> > assumtion that something like /home or / is allocating trees of
> > unrelated subdirectories at the top level, but that files within those
> > subdirectories ARE related and should be allocated together.
> >
> > Depending on how many files are in your cache, the 256 * {small files}
> > is likely too big to fit into a single block group (32k inodes, 32k
> > blocks) so you may want to consider marking the first level of
> > subdirectories with the "TOPDIR" flag, that indicates the second-level
> > (256) subdirs should also be spread around the disk.
>
> How do I mark subdirectories with the "TOPDIR" flag?
Found it: chattr +T
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