Problemas com RAID 1

["Reinaldo U. Santos Jr." <reinaldo-listas@aplinet.com.br>]

Boa noite!

Estou instalando o Debian Etch em uma máquina com dois HDs SATA. Minha
intenção é implementar RAID 1 com esses dispositivos.
Acontece que quando eu vou gravar as partições no disco, surge a
seguinte mensagem:

Error informing the kernel about modifications to partition
/dev/md/0p1 -- Invalid argument. This means Linux won't know about
any changes you made to /dev/md/0p1 until you reboot -- so you
shouldn't mount it or use it in any way before rebooting.
ERROR!!!

E:

The kernel was unable to re-read the partition table on /dev/md/0
(Invalid argument). This means Linux won't know anything about the
modifications you made until you reboot. You should reboot your
computer before doing anything with /dev/md/0.

Alguém já passou por isso?

Abraços,
Reinaldo