root@ubuntu:/home/ubuntu# mount -t auto -o rw /dev/sdb /mnt/md
mount: unknown filesystem type 'promise_fasttrack_raid_member'

root@ubuntu:/home/ubuntu# dmraid -tay
pdc_efbc: 0 931640448 striped 3 128 /dev/sdb 0 /dev/sdc 0 /dev/sdd 0
pdc_efbc1: 0 312578048 linear /dev/mapper/pdc_efbc 2048

root@ubuntu:/home/ubuntu# dmraid -ay
RAID set "pdc_efbc" already active
RAID set "pdc_efbc1" already active

root@ubuntu:/home/ubuntu# mount -t auto -o rw /dev/mapper/pdc_efbc /mnt/md
mount: /dev/mapper/pdc_efbc already mounted or /mnt/md busy

grub>
Error 23: Error while parsing number