Gmirror + gpart corruption on 9.3-PRE

[Dave Hayes]

At 9.3-PRERELEASE #0 r268066M I've been trying unsucessfuly to set up a 
brand shiny new gmirror + gpt style Raid 0 mirror using the following 
procedure on a disk

  gpart create -s gpt ada0
  ( shows 931G of space)
  gpart add -s 96G -t freebsd-swap -l swap0 ada0
  gpart add -t freebsd-ufs -l rw0 ada0
  gpart create -s gpt ada1
  gpart add -s 96G -t freebsd-swap -l swap1 ada1
  gpart add -t freebsd-ufs -l rw1 ada1
  gmirror label swap /dev/ada0p1 /dev/ada1p1
  gmirror label rw   /dev/ada0p2 /dev/ada1p2
  gpart create -s gpt mirror/swap
  gpart add -s95G -t freebsd-swap -l FBCDSWAP mirror/swap
  gpart create -s gpt mirror/rw
  gpart add -s833G -t freebsd-ufs -l FBCDRW mirror/rw

This consistently gives me the dreaded

  GEOM: mirror/rw: the secondary GPT table is corrupt or invalid

just as soon as I provision the mirror/rw device.

I have tried many ideas of padding these partitions so I don't get this 
message, but to noavail. I'm willing to try more, the machine isn't live 
(yet) so it can sit here while it gets figured out. :)

Back at 9.2-PRERELEASE #0 r255456 I used the same procedure for setting 
up a gmirror, and this worked fine with no corruption. Here's the 
partition table:

 > gpart show
=>       34  976773101  ada0  GPT  (465G)
          34   46245840     1  freebsd-swap  (22G)
    46245874  930523232     2  freebsd-ufs  (443G)
   976769106       4029        - free -  (2M)

=>       34  976773101  ada1  GPT  (465G)
          34   46245840     1  freebsd-swap  (22G)
    46245874  930523232     2  freebsd-ufs  (443G)
   976769106       4029        - free -  (2M)

=>      34  46245772  mirror/swap0  GPT  (22G)
         34  46245772             1  freebsd-swap  (22G)

=>       34  930523164  mirror/rw0  GPT  (443G)
          34  926941184           1  freebsd-ufs  (442G)
   926941218    3581980              - free -  (1.7G)


I've since upgraded this machine to the exact same 9.3 revision and it 
still works fine, no corruption. Am I missing something or did something 
change in between these two revisions that makes it difficult or 
different to set up?

Thanks in advance for any insight you all can provide.
-- 
Dave Hayes - Consultant - Altadena CA, USA - dave at jetcafe.org
 >>>> *The opinions expressed above are entirely my own* <<<<

Enjoyment is not a goal,
it is a feeling that accompanies important ongoing activity