On Wednesday April 10, mooasun@yahoo.com wrote: > > Neil, > > I tried with "mdadm -C /dev/md0 --level raid1 --raid-disks 2 /dev/hda1 --fail /dev/hdc1" > to make a MD device with a faulty device. However, It did not work what I expected. > I do not want to include /dev/hdc1 yet because it has the system image, but it tried to > include it. > Any suggestion? Yes. If you don't want /dev/hdc1 to be included, don't include it. If you say: # mdadm -C /dev/md0 --level raid1 --raid-disks 2 /dev/hda1 It will say: mdadm: You haven't given enough devices (real or missing) to create this array The word "missing" is meant to be a hint, but I don't think it is documented (I've just made a TODO note to fix that - thanks). The command: # mdadm -C /dev/md0 --level raid1 --raid-disks 2 /dev/hda1 missing will create your array with /dev/hda1 in the first slot, and no device in the second slot. NeilBrown - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html