On Mon, 3 Sep 2001, Jason R Thorpe wrote:
> So, for the larger the file system you're creating, newfs_ffs bumps the
> blocksize and the cpg using some hueristic (coming up with the correct
> hueristic is left as an exercise for the reader).

Here's a heuristic I have been using:

   In the per-device disklabel parameters, lie about the number of
   sectors per track or tracks per cylinder (or both) in such a way that
   the number of sectors per cylinder ends up being approximately equal
   to the number of cylinders (and both sectors/cylinder and ncylinders
   end up being reasonably close to the square root of the total sectors
   on the device).

   In the per-filesystem disklabel parameters for FFS filesystems, try
   to pick cylinders/group and blocksize such that there will be fewer
   than 100 cylinder groups.

--apb (Alan Barrett)