vmx(1) documentation in the dash1: http://fqa.9front.org/fqa8.html#8.7.5.1
script i use to run openbsd: http://plan9.stanleylieber.com/rc/openbsd in my setup opensd is the first hard drive and 9front is the second. vmx(1) runs openbsd from the hard drive installation. note: performance is terrible. sl