amd64/183866: graid cannot remove loader detected BIOS RAIDS

[Gerard Cerchio]

>Number:         183866
>Category:       amd64
>Synopsis:       graid cannot remove loader detected BIOS RAIDS
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-amd64
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Nov 11 17:10:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator:     Gerard Cerchio
>Release:        9.1
>Organization:
CircleSoft Llc
>Environment:
FreeBSD cserve 9.1-RELEASE-p7 FreeBSD 9.1-RELEASE-p7 #0: Mon Sep  9 21:34:37 UTC 2013     root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  amd64
>Description:
The loader detects old BIOS meta data when kern.geom.raid.enable=1.

When the system is booted with kern.geom.raid.enable=0, graid status does not report the old BIOS data.

A catch-22 ensues that does not allow the deletion of the old BIOS meta data which would allow the construction of a FreeBSD software RAID.
>How-To-Repeat:
1. create a RAID on 2 drives using the BIOS
2. remove that RAID and configure the drives in IDE mode with the BIOS
3. install FreeBSD 9.0 and construct a gpart gmirror software RAID
4. freebsd_update to FreeBSD 9.1

>Fix:
Import the loader BIOS raid detection software into graid

>Release-Note:
>Audit-Trail:
>Unformatted: