Redundant Array of Independent Disks (RAID)

Sofware RAID with mdadm (multiple disks admin).

Create

1. fdisk /dev/sdX (t fd; for each)
2. partprobe -s
3. mdadm -C /dev/md0 -l1 -n2 /dev/sdX# /dev/sdY# (-C is --create; -l1 is --level=1; -n2 is --raid-disks=2)
   • cat /proc/mdstat
4. mkfs.ext4 /dev/md0
5. mount /dev/md0 <MountPoint> For automount at boot:
6. mdadm --detail --scan | tee -a /etc/mdadm/mdadm.conf
7. echo 'UUID=whatever /mnt/md0 ext4 defaults,nofail 0 0' | tee -a /etc/fstab For early boot process availability:
8. update-initramfs -u

Remove

1. mdadm --stop /dev/md0
2. mdadm --remove /dev/md0
   • cat /proc/mdstat
3. mdadm --zero-superblock -f /dev/sdX (for each)
4. update-initramfs -u

Levels