On Wed, Jan 09, 2008 at 02:00:31AM -0500, Nick Guenther wrote:
quoted text
> On Jan 9, 2008 1:22 AM, William Sloan <wsloan@wooferstar.net> wrote:
> > Dear misc --
> >
> >         I'm attempting to get a root partition on raid 1 RaidFrame
> > configuration working with OpenBSD 4.2.  I have a Soekris 4801 with a
> > compact flash card, a USB 2.0 PCI card and 2 identical external usb
> > hard drives.
> >
> >         I built a new kernel configured with the pseudo-device raid 4 and
> > option RAID_AUTOCONFIG.
> >
> >         I installed OpenBSD on the compact flash, created and initialized
> > the raid array, set the raid device to autoconfigure and set the root
> > flag, changed fstab on the raid disks to point root to raid0a instead
> > of wd0a and rebooted.  When the system rebooted wd0a was mounted as
> > root.
> >
> >         Attached is dmesg, mount, raid0.conf, disklables. raidctl -sv output.
> >
> >         If someone can point me in the direction of what to look at or give
> > me any ideas of what could be going wrong.
> >
> 
> When you build your new kernel you also need to change config(8) to
> "set root on raid0". fstab isn't read until *after* the root is
> mounted, remember; how is it going to know to read from
> raid0a:/etc/fstab if the file to tell it that is raid0a:/etc/fstab?
> 

This was not needed in 4.1, just setting the RAID_AUTOCONFIG and
setting the root flag on the raid array was enough, just as wsloan
did it was enough. This is my /usr/src/sys/arch/i386/conf/GENERIC.RAID:
#
# GENERIC.RAID - Add kernelized RAIDframe disk driver
#
include         "arch/i386/conf/GENERIC"

option          RAID_AUTOCONFIG
pseudo-device   raid                    4

My raid0 has
   Autoconfig: Yes
   Root partition: Yes
and that was enough in OpenBSD 4.1

Has the behaviour changed?

Is there somewhere else to configure the root device, e.g from
/etc/boot.conf. I know you can give a flag -a to boot(8) to make
the kernel ask for a root device, but I do not find a root device
variable to set there, nor in options(4) and boot_config(8).

quoted text
> -Nick

-- 

/ Raimo Niskanen, Erlang/OTP, Ericsson AB