Jesse> It should be noted that the cpg field in your disklabel does
    Jesse> not mean the same thing to newfs_lfs as it does to newfs_ffs.
    Jesse> Default segment size is derived by shifting the block size by
    Jesse> the cpg.  For instance, if the block size in your disk label
    Jesse> is 8192, and you have a cpg of 16, your segment size would be
    Jesse> 8192 << 16, or 536870912 bytes.  Thats crazy.

i filed PR 9230 awhile back along these lines.  something in the spirit
of this really ought to get committed.

matt