I can't get my hands on one of these servers until Monday and my client who asked for a solution based on OpenBSD would like some idea of the probability of using the hotswap raid capability of the DL360.
It appears the dl360's 6i is a ciss card (http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/dev/ciss/), and it doesn't appear OpenBSD supports it from a quick browse through the source.
