Summing up, the way to get a bootable RAID 1 set with current on the
i386 platform is to build a situation like the one shown here:

barsoom# fdisk sd0
[...]
3: NetBSD (sysid 169)
    start 512, size 17915728 (8748 MB, Cyls 34/0/3-1194416), Active
Bootselector disabled.
barsoom# disklabel -r sd0
[...]
 a:   4718656       512       RAID                     #
 c:  17915728       512     unused      0     0        #
 d:  17916240         0     unused      0     0        #
[...]
barsoom# disklabel -r raid0
[...]
 a:    524288         0     4.2BSD   1024  8192 46376  # (Cyl.      0 -   1023)
 d:   4718592         0     unused      0     0        # (Cyl.      0 -   9215)
[...]
barsoom# cp /usr/mdec/biosboot /boot
barsoom# installboot /dev/rsd0a /usr/mdec/bootxx_ffsv1

The offset of 512 sectors is more than is needed; 63 is more common,
but I read somewhere that it had to be at least one full, physical
track, and I just sort of rounded up...  :-)

-tih
-- 
Tom Ivar Helbekkmo, Senior System Administrator, EUnet Norway
www.eunet.no  T: +47-22092958 M: +47-93013940 F: +47-22092901