Issues mirroring drives with Vinum in FreeBSD 4.8-RELEASE

[aarong]

I've successfully installed and converted a FreeBSD 4.8 install into a 
bootable Vinum volume many times; however mirroring that volume onto a 
second identical drive is proving difficult. Per Greg Lehey's 
instructions in chapter 12 of "The Complete FreeBSD 4th Edition", I've 
setup a bootable Vinum volume and then attempted to mirror it by 
creating a second Vinum config file, detailing the second drive and how 
the new volumes should be setup.

This works fine, and Vinum will successfully complete mirroring the all 
the volumes, however fsck will fail everytime. Hence when rebooting, 
everything goes to hell and a hand basket. I can fsck the volumes 
before mirroring without a problem, it's only after Vinum completes 
mirroring the volumes that fsck complains.

Both drives are identical Seagate Cheetah X15's, with swap taking 
1000M, root 125M, var taking 4000M, and usr taking the rest. I tried 
installing FreeBSD, and creating both Vinum volumes at the same time 
with the same effect.

/boot/loader.conf:

vinum_load="YES"
vinum.drives="/dev/da0 /dev/da1"
vinum.root="root"

disklabel da0s1:

#        size   offset    fstype   [fsize bsize bps/cpg]
   a:   256000  2048000    4.2BSD     2048 16384    94   # (Cyl.  127*- 
143*)
   b:  2047719      281      swap                        # (Cyl.    0*- 
127*)
   c: 71681967        0    unused        0     0        # (Cyl.    0 - 
9728*)
   e:  8192000  2304000    4.2BSD     2048 16384    89   # (Cyl.  143*- 
653*)
   f: 61185967 10496000    4.2BSD     2048 16384    89  # (Cyl.  653*- 
9728*)
   h: 71681967       16     vinum                       # (Cyl.    0*- 
9728*)

disklabel da1s1:

#        size   offset    fstype   [fsize bsize bps/cpg]
   a:   256000  2048000    4.2BSD     2048 16384    94   # (Cyl.  127*- 
143*)
   b:  2047719      281      swap                        # (Cyl.    0*- 
127*)
   c: 71681967        0    unused        0     0        # (Cyl.    0 - 
9728*)
   e:  8192000  2304000    4.2BSD     2048 16384    89   # (Cyl.  143*- 
653*)
   f: 61185967 10496000    4.2BSD     2048 16384    89  # (Cyl.  653*- 
9728*)
   h: 71681967       16     vinum                       # (Cyl.    0*- 
9728*)

/vinum.config:

drive alpha device /dev/da0s1h
drive beta device /dev/da1s1h
volume root
   plex org concat
         sd len 256000s		driveoffset 2047984s drive alpha
   plex org concat
         sd len 256000s		driveoffset 2047984s drive beta
volume swap
   plex org concat
         sd len 2047719s	driveoffset 265s drive alpha
   plex org concat
         sd len 2047719s	driveoffset 265s drive beta
volume var
   plex org concat
         sd len 8192000s	driveoffset 2303984s drive alpha
   plex org concat
         sd len 8192000s	driveoffset 2303984s drive beta
volume usr
   plex org concat
         sd len 145800322s	driveoffset 10495984s drive alpha
   plex org concat
         sd len 145800322s	driveoffset 10495984s drive beta

vinum create /vinum.config
vinum start root.p1
vinum start var.p1
vinum start swap.p1
vinum start usr.p1

Obviously I'm missing a vital step here but I'm completely at a loss as 
to what it may be. The Handbook clearly outlines how to mirror volumes 
and as far as I can tell, the above should work flawlessly. I run into 
the same issues with 5.1-RELEASE. Comments, criticism, and answers are 
all appreciated. Please CC me as I am not subscribed to this list.

-aarong