An earlier post to misc@ made me look into diskmap(4), but the man page seems to be missing:
This was a fresh install from CD: # uname -a OpenBSD srv000.home.lan 4.8 GENERIC.MP#335 amd64 # man diskmap man: no entry for diskmap in the manual. # ls /dev/diskmap /dev/diskmap This was an upgrade from CD: gw:remco$ uname -a OpenBSD gw.home.lan 4.8 GENERIC#136 i386 gw:remco$ man diskmap man: no entry for diskmap in the manual. gw:remco$ ls /dev/diskmap /dev/diskmap I don't know if this is the right way to look for the man page, but this comes up empty: gw:OpenBSD$ tar tzf 4.8/i386/man48.tgz |grep diskmap gw:OpenBSD$ tar tzf 4.8/amd64/man48.tgz |grep diskmap gw:OpenBSD$ The on-line manual doesn't really make it clear to me on how to use this either. (http://www.openbsd.org/cgi-bin/man.cgi?query=diskmap&sektion=4) The only "documentation" I was able to find is: http://marc.info/?l=openbsd-misc&m=128317640726155&w=2