Vinum & FreeBSD 4.11-STABLE

[Forth]

Hi,
I am trying setup a vinum mirrored plex with two disks:
>ad2: 38204MB <SAMSUNG SP0411N> [77622/16/63] at ata1-master UDMA33
>ad3: 38204MB <SAMSUNG SP0411N> [77622/16/63] at ata1-slave UDMA33
Disks are new and fully functional, but when i do:
#vinum start
#vinum
vinum -> mirror -v -n mirror /dev/ad2 /dev/ad3
i get this:
drive vinumdrive0 device /dev/ad2
Can't create drive vinumdrive0, device /dev/ad2: Can't initialize drive 
vinumdrive0

P.S 
Sorry for my english.:)