29 Mar 2019, 02:42 by n...@holland-consulting.net:

> On 3/28/19 10:29 AM, Rachel Roch wrote:
>> Hi,
>> I've been following the instructions here
>> https://www.openbsd.org/faq/faq14.html 
>> <https://www.openbsd.org/faq/faq14.html>
>> <>> https://www.openbsd.org/faq/faq14.html 
>> <https://www.openbsd.org/faq/faq14.html>>> > to setup softraid.
>> Unfortunately I somehow messed up the original attempt through my own
>> stupidity.
> it happens.
> And best that it happen before production than after.
>> So I've been trying to go through the steps again.  However nothing
>> I do can elminate the "softraid0 sd0a chunk already in use" message
>> at the "bioctl -c 1 -l sd0a,sd1a softraid0" step.
>> I've tried everything !  Rebooting the server, /dev/zero to the
>> first 500MB of sd0 and sd1, changing uuid in disklabel, erasing and
>> re-writing disk label.
>> I looked at the man page and thought "ah ha !" ... maybe "-C force",
>> but nope !
> you were close with the zeroing the head of the components.  In fact,
> I'm not sure what you did wrong, but that's the solution.
> I'd suggest starting by zeroing the beginning of each physical disk --
> using the r device and the c partition -- i.e.,
>  # dd if=/dev/zero of=/dev/rsd0c
>  # dd if=/dev/zero of=/dev/rsd1c
> I've had enough problems, I really suggest this unless you are
> absolutely sure your disk has never even heard of OpenBSD before you
> install it. :)  (I think I had figured out at one point that zeroing the
> RAID partitions was sufficient, but when it comes to zeroing, a little
> more is never too much. :)
> Now, if you were going to script this, you would put a block size and a
> count in there...but since you are just typing this at the command line,
> count to three and hit CTRL-C then do the next.  You really only have to
> clear a megabyte or so, and probably a LOT less...you can't hit CTRL-C
> fast enough, I suspect. :)
> By using the 'r' device and the 'c' partion, you have wiped the very
> very start of the disk -- sector zero onward.
> I'd reboot after that.  I don't think it's needed, but either the
> disklabel or MBR partition can be held in memory and written back out to
> disk under some circumstance, I don't recall exactly what (probably
> having to do with mounted partitions), so a reboot, and then verifying
> that fdisk sd0 shows lots of zeros everywhere including the Signature.
> NOW fdisk, create your OpenBSD partition, then your RAID disklabel
> partitions, and you should be in business.
> If that doesn't do it, show us your exact commands and exact output you
> are seeing.
> Nick.

Thanks Nick !  Your suggestion did the trick.

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