>Can anyone tell me why sysinst wants to make the root filesystem
>20MB plus two times the RAM size on many architectures?

Sure.  On the i386 20MB was enough for / (minus /usr) and some
space for log files and the 2xRAM was for 2 kernel crash dumps
into /var/crash.  If one made a standard practice of doing
a symlink from /var/crash to some other place, this could just
be the 20MB.  (Or what ever size seems resonable for the
port.)

-- 
Phil Nelson
phil@steelhead.cs.wwu.edu (NetBSD/pc532 machine)
phil@cs.wwu.edu (work)
http://www.cs.wwu.edu/~phil