Part of Linux
In Debian:
sudo apt get install mdadm
You can use:
sudo mdadm -E /dev/sd[b-c]
to check if the devices are part of a RAID / super-block is found.
sudo fdisk /dev/sdX
To create the partition, input the following values in order. Each Input should be followed by a confirmation (ENTER)
| Value | Description |
|---|---|
| n | New primary Partition |
| P | Define as Primary Partition |
| 1 | Partition Number |
| (ENTER) | Confirm Default Starting Block |
| (ENTER) | Confirm Default End Block |
| t | Choose partitions type |
| fd | Partition type: Linux Raid auto |
| w | Write Changes |
| Value | Description |
|---|---|
| d | Delete selected partition |
| p | Print partitions information |
| L | List available types of partitions |
Don't forget to repeat the steps for all disks you using on the RAID.
sudo mdadm --create /dev/md0 --level=mirror --raid-devices=2 /dev/sd[b-c]1
| Value | Description |
|---|---|
| –create | Create a new RAID |
| /dev/md0 | Using /dev/md0 |
| –level=mirror | Raid as Mirror |
| –raid-devices=2 | Use 2 devices |
| /dev/sd[b-c]1 | The devices sdb1 and sdc1 |
Use mkfs to create a ext4 File System with:
sudo mkfs.ext4 /dev/md0
Edit your fstab to auto-mount your RAID on boot:
sudo nano /etc/fstab
Eg:
/dev/md0 /mnt/md0 ext4 defaults,nofail 0 0
To make sure that the array is reassembled automatically at boot, adjust your /etc/mdadm/mdadm.conf:
sudo mdadm --detail --scan | sudo tee -a /etc/mdadm/mdadm.conf
Uncomment - if necessary - your array on /etc/mdadm/mdadm.conf by removing the Starting “#”:
sudo nano /etc/mdadm/mdadm.conf
Update the initramfs again so that the early boot process does not try to bring an unavailable array online:
sudo update-initramfs -u
You can use the following commands to check the status of your RAID:
sudo mdadm -E /dev/sd[b-c]1
sudo mdadm --detail /dev/md0