geometry/media size does not match label messages

I have an existing system running stable/7 and am preparing to upgrade 
it to stable/8 (as of r199085).  The system has two slices mirrored. 
Upon booting from a Fixit disc, there are messages I see with stable/8 
but not stable/7:

GEOM: ad4s3: geometry does not match label (255h,63s != 16h,63s).
GEOM: ad4s3: media size does not match label.
GEOM: ad6s3: geometry does not match label (255h,63s != 16h,63s).
GEOM: ad6s3: media size does not match label.

This also occurs when having mirrored two freshly created slices (within 
VirtualBox), so it is not an existing issue seen from a newer kernel 
branch.  I have a script[1] to perform the creation from the Fixit disc 
to show how I built the system.

>From what I understand, these messages are due to the order GEOM tastes 
providers.  Since mirrored slices may actually be from different drives 
and not match, I can see why the labels may not match.  Should/could the 
tasting be adjusted to prevent these messages from appearing assuming 
everything is valid?  It looks valid, yes?

The swap slices using gpart or bsdlabel:
Geom name: ad4s2
fwheads: 16
fwsectors: 63
last: 8388575
first: 0
entries: 8
scheme: BSD

bytes/sector: 512
sectors/track: 63
tracks/cylinder: 16
sectors/cylinder: 1008
cylinders: 8322
sectors/unit: 8388576
...
8 partitions:
#        size   offset    fstype   [fsize bsize bps/cpg]
   c:  8388576        0    unused        0     0         # "raw" part, don't edit
   h:  8388560       16      swap


Here is the slice from the mirror (or ad[46]s3 if preferred):
Geom name: mirror/slice0
fwheads: 255
fwsectors: 63
last: 75497434
first: 0
entries: 8
scheme: BSD

bytes/sector: 512
sectors/track: 63
tracks/cylinder: 255
sectors/cylinder: 16065
cylinders: 4699
sectors/unit: 75497435
...
8 partitions:
#        size   offset    fstype   [fsize bsize bps/cpg]
   a:  4194304       16    4.2BSD        0     0     0
   b:  4194304  4194320    4.2BSD        0     0     0
   c: 75497435        0    unused        0     0         # "raw" part, don't edit
   d:  8388608  8388624    4.2BSD        0     0     0
   e: 58720203 16777232    4.2BSD        0     0     0

Sean
   1. http://people.freebsd.org/~scf/Install-gmirror-MBR.txt
-- 
scf_at_FreeBSD.org