Gmirror on a partition of a slice

[n j]

Hello,

I've originally sent this mail to -questions, but -geom is probably
the better place to ask for pointers to any help regarding installing
gmirror on a partition of a slice. Here's the problem.

Using http://www.onlamp.com/pub/a/bsd/2005/11/10/FreeBSD_Basics.html
and http://people.freebsd.org/~rse/mirror/ as pointers, as well as
handbook and man pages, I tried to set up gmirror on a partition of a
slice the following way (using identical 1Gb disks da0 & da1):

1) install FreeBSD on 1st disk /dev/da0s1a

2) create slice on 2nd disk fdisk -BI /dev/da1

3) bsdlabel -w -B /dev/da1s1

4) edit BSD label to create a ~500 Mb partition for gmirror
a:  1000000       16    4.2BSD       2048     16384    8
c:  2097120        0    unused        0     0         # "raw" part

5) gmirror label -h -n -b round-robin gm0 /dev/da1s1a to create mirror

6) fdisk -BI /dev/mirror/gm0 to create a slice in gm0

7) bsdlabel -w -B /dev/mirror/gm0s1 to create root partition
a:  995951   16     4.2BSD     2048 16384 8
c:  995967    0       unused        0     0         # "raw" part

8) newfs, mount, dump/restore to /dev/mirror/gm0s1a, modify fstab,
loader.conf, create boot.config to boot off mirror

9) reboot

... and at that point I get "Not ufs" and "No /boot/loader". Any kind
of input, be it a link to some material on the web or a proper
sequence of command is much appreciated. I've googled a lot and
haven't found any examples/howtos/tutorials on how to set up what I'm
trying to do.

Thanks,
-- 
Nino