Vinum, newfs: could not open special device

[Benjamin Keating]

Hey all. Running FreeBSD 5.3 with GENERIC kernel. This isn't high
priority, but I've never had problems with Vinum before and this one's
got me stumped.

########################
#### /etc/vinum.conf ###
########################

bigbang# cat /etc/vinum.conf
drive a device /dev/ad4e
drive b device /dev/ad5e
drive c device /dev/ad6e
volume backup
  plex org raid5 384k
    sd length 0 drive a
    sd length 0 drive b
    sd length 0 drive c

########################

### MY STEPS ###
1). bsdlabel -w /dev/ad{4,5,6}
2). bsdlabel -e /dev/ad{4,5,6}
2.1). removed partiion "a"
      copied partition "c" and changed fstype to "vinum"
      :wq
3). vinum config -f /etc/vinum.conf
4). newfs /dev/vinum/backup

### PROBLEM  ###
newfs: /dev/vinum/backup: could not open special device