kern/138891: [geom] GEOM_PART_* fails with sliced gstripe

[marcel at FreeBSD.org]

Synopsis: [geom] GEOM_PART_* fails with sliced gstripe

State-Changed-From-To: open->closed
State-Changed-By: marcel
State-Changed-When: Thu Sep 17 20:25:11 UTC 2009
State-Changed-Why: 
Your disk partitioning is invalid. You cannot have both a MBR and
a BSD disk label in the same place and independently of each other.
    ace# fdisk /dev/stripe/raid0
    ace# bsdlabel /dev/stripe/raid0
If you look closely, FreeBSD 7.2 will use the MBR on /dev/stripe/raid0
and the BSD disklabel on /dev/stripe/raid0s4. However, since a BSD
disklabel also embeds a MBR, FreeBSD 8.0 will correctly prefer the
BSD disklabel on /dev/stripe/raid0. However, the BSD disk label is
not the one that should be used.
Fix the problem by wiping out the second sector on the disk.
BTW: the problem is caused by creating a dangerously dedicated
installation. It's known to be broken and should not be used.
FYI,

http://www.freebsd.org/cgi/query-pr.cgi?pr=138891