Is there any documentation for how to set up RAID for a NetBSD system 
other than the man pages for raidctl?

Basically, I want to create a new system using RAID level 1, 
mirroring between two identical drives. Each drive would have the 
entire filesystem on it (/, swap, and /usr). I haven't seen any RAID 
choices in the installer, so I imagine that I have to do the initial 
install on wd0, and then use raidctl to make wd1 the mirror of wd0. 
Is this OK? Is there a better way to do it?

And, for the harder question, what if wd0 and wd1 are not identical 
hardware? What will be the reliability and performance issues?