here is a link to the relevant mailing list conversations
http://www.nabble.com/problem-with-RAIDframe-setup-%28my-mistake%29-setting-a-root-mirror-tf1574067.html#a4273917

On 11/10/06, Christoph Kaegi <kgc@zhwin.ch> wrote:
>
> I'm setting up a NetBSD 3.1 system with two identical disks that
> should be mirrored.
>
> I have labeled the raid0 device as usual, like this:
>
>  a:   2098059         0     4.2BSD   1024  8192 45616  # (Cyl.      0 -   2048*)
>
>
> Now, when I try to newfs this slice, it says:
>
>  wtfs: write error for sector 16: Read-only filesystem
>
> I tried to let the filesystem start at sector 63. That worked
> for the newfs part, but then the computer didn't boot anymore,
> saying:
>
>   Boot failed (errno 2): Can't open /boot.
>
> So i guess I have to solve the former problem first: why
> can't I newfs the raid0a slice?
>
> The disk is a Seagate ST336607LC. Someone on the mailing list
> had a similar problem and had to add it to a quirk table. Does
> that ring a bell for someone?
>
> Thanks
> Chris
>
> --
> ----------------------------------------------------------------------
> Christoph Kaegi                                           kgc@zhwin.ch
> ----------------------------------------------------------------------
>