Disk partition sizes on big disks.

[Dave Martindale]

4.1BSD restor (and V7, for that matter) is rather slow because of the
way it spends so much time copying data around.  But "dump" is much more
careful about this thing; it even sorts the data blocks which are to be
read for any particular tape block to speed things up.  Once you get a 6250
BPI drive, you will find that dump spends the vast majority of its time
reading disk, not writing tape.  Splitting a large filesystem into smaller
ones won't help this any.  4.2BSD's larger block sizes and more careful
disk layout should speed things up considerably though.