https://netbsd.org/docs/guide/en/chap-rf.html#chap-rf-intro-about says [...] RAIDframe can also be found in OpenBSD and older versions of FreeBSD. [...]
but https://www.openbsd.org/52.html from 2012 says Removed the raid(4) RAIDframe driver and its corresponding raidctl(8) utility. RAIDframe has been superseded by softraid(4). See https://man.openbsd.org/OpenBSD-5.1/raid.4 https://man.openbsd.org/softraid.4
