Buenas;
Segue dica para instalar o OpenBSD 5.4 com dois discos em RAID 1 via software (softraid).
(I)nstall, (U)pgrade or (S)hell? s # cd /dev # sh /dev/MAKEDEV sd1 sd2 # fdisk -iy sd0 Writing MBR at offset 0. # fdisk -iy sd1 Writing MBR at offset 0. # disklabel -E sd0 Label editor (enter ‘?’ for help at any prompt) > a a offset: [64] [ENTER] size: [41929586] [ENTER] FS type: [4.2BSD] RAID > q Write new label?: [y] y # cd /tmp # disklabel sd0 > protofile # disklabel -R sd1 protofile # bioctl -c 1 -l /dev/sd0a,/dev/sd1a softraid0 sd2 at scscibus2 targ 1 lun 0: <OPENBSD, SR RAID 1, 005> SCSI2 0/direct fixed sd2: 20473MB, 512 bytes/sector, 41929058 sectors softraid0: RAID 1 volume attached as sd2 # dd if=/dev/zero of=/dev/rsd2c bs=1m count=1 1+0 records in 1+0 records out 1048576 bytes transferred in 0.009 secs (111337439 bytes/sec) # exit
O instalador voltará para a tela inicial. Escolha a opção (I)nstall e proceda normalmente com a instalação. Lembre-se de realizar a instalação no disco sd2 (volume RAID criado pelo softraid).
Referência:
http://spiritedblowfish.wordpress.com/2012/07/19/installing-openbsd-5-1-amd64-using-softraid/