Squid and first-level subdirectories & second-level subdirectories on ext3/4

[Ralf Hildebrandt]

* Ralf Hildebrandt <Ralf.Hildebrandt at charite.de>:
> * Andreas Dilger <adilger at dilger.ca>:
> 
> > 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