[CentOS] RAID1 migration - /dev/md1 is not there

[Sam Beam]

I am trying to convert an existing IDE one-disk system to RAID1 using the 
general strategy found here:

http://lists.centos.org/pipermail/centos/2005-March/003813.html

But I am stuck on one thing - when I went to create the second md device with 
mdadm, 

# mdadm --create /dev/md1 --level=1 --raid-devices=2 /dev/hdb2 missing
mdadm: error opening /dev/md1: No such file or directory

And indeed, ls /dev/md* shows only md0, which worked fine.

I do have the 'raid1' kernel module loaded.

What am I missing? Do I need to create the nodes manually now?

thanks
-S