RAID 1 configuration failure(Provider Too Small)

[Sean Bruno]

I'm trying to setup a 2 disk RAID 1 on my Dell PE 1850 between two 
identical Seagate SCSI drives with the howto at: 
http://www.onlamp.com/pub/a/bsd/2005/11/10/FreeBSD_Basics.html

I am able to convert my root drive(da0) to geom and reboot just fine.  I 
am failing when I run:

|*gmirror insert gm0 /dev/da1*|


The second step of converting the mirror drive of my RAID1 (da1) fails 
with the same "Provider da1 too small" error no matter what I attempt to 
do.  The drives are reporting exactly the same size according to 
fdisk(see below).  Any ideas here?

desdemona# fdisk /dev/da1
******* Working on device /dev/da1 *******
parameters extracted from in-core disklabel are:
cylinders=8924 heads=255 sectors/track=63 (16065 blks/cyl)

Figures below won't work with BIOS for partitions not in cyl 1
parameters to be used for BIOS calculations are:
cylinders=8924 heads=255 sectors/track=63 (16065 blks/cyl)

Media sector size is 512
Warning: BIOS sector numbering starts with sector 1
Information from DOS bootblock is:
The data for partition 1 is:
<UNUSED>
The data for partition 2 is:
<UNUSED>
The data for partition 3 is:
<UNUSED>
The data for partition 4 is:
<UNUSED>
desdemona# fdisk /dev/da0
******* Working on device /dev/da0 *******
parameters extracted from in-core disklabel are:
cylinders=8924 heads=255 sectors/track=63 (16065 blks/cyl)

Figures below won't work with BIOS for partitions not in cyl 1
parameters to be used for BIOS calculations are:
cylinders=8924 heads=255 sectors/track=63 (16065 blks/cyl)

Media sector size is 512
Warning: BIOS sector numbering starts with sector 1
Information from DOS bootblock is:
The data for partition 1 is:
sysid 165 (0xa5),(FreeBSD/NetBSD/386BSD)
    start 63, size 143363997 (70001 Meg), flag 80 (active)
        beg: cyl 0/ head 1/ sector 1;
        end: cyl 1023/ head 254/ sector 63
The data for partition 2 is:
<UNUSED>
The data for partition 3 is:
<UNUSED>
The data for partition 4 is:
<UNUSED>