Adding a new RAID1 array using mdadm
1. fdisk one of the newly added hard drives:
fdisk /dev/hdc
n, p, 1, <enter>, <enter>
t, fd
w
2. dump new partition table to the other disk:
sfdisk -d /dev/hdc | sfdisk /dev/hdd
3. create new RAID1 set/device:
mdadm --create /dev/md6 --level=1 --raid-disks=2 /dev/hdc1 /dev/hdd1
4. format the newly created array:
mkfs.ext3 /dev/md6
5. create mount point for new array:
mkdir /raid
6. append new mount point to /etc/fstab:
/dev/md6 /raid ext3 defaults 0 0
7. mount:
mount
8. reboot if you’re paranoid.
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