I'm looking to set up a test unit this summer to try RAID 1+0 or 3+0.
The goal is to be able to stream data quickly but tolerate loss of at
least one disk at a time.

It looks like there are three options supporting at least RAID level 0
and 1, can/should any of these be stacked yet?

 softraid
  http://www.openbsd.org/cgi-bin/man.cgi?query=softraid

 raidframe
  http://www.openbsd.org/cgi-bin/man.cgi?query=raid

 ccd
  http://www.openbsd.org/cgi-bin/man.cgi?query=ccd

It looks like one disk (or CF) is needed for a base OpenBSD system, and
the other 4+ for RAID.  Is that the best way to ensure unattended booting?

Also, what kind of data would you want back on the tests?  It's early
enough that I can work it into the plans.

Regards,
-Lars