Here is a detailed article on how to install RAID1 on a Ubuntu server with a second HDD without wiping everything and reinstalling every single program.
Install RAID1 on Ubuntu Server with Second HDD
If your home server is installed with Ubuntu and you decide to buy a second HDD to use RAID1, but you don't want to wipe everything and reinstall every single program, this guide is for you.
Prerequisites
- A Ubuntu server with at least two HDDs.
- One HDD with the operating system installed (referred to as /dev/sda in this guide).
- A second HDD that is not yet used (referred to as /dev/sdb in this guide).
Step 1: Install mdadm
First, you need to install the Multiple Disk Administration (mdadm) tool. This tool will help you manage the RAID arrays.
sudo apt-get update
sudo apt-get install mdadm
Step 2: Create RAID1 Array
Next, create the RAID1 array. Replace /dev/sda and /dev/sdb with your actual device names.
sudo mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sda /dev/sdb
Step 3: Format the RAID1 Array
Now, format the RAID1 array with the ext4 file system.
sudo mkfs.ext4 /dev/md0
Step 4: Mount the RAID1 Array
Create a directory where you will mount the RAID1 array.
sudo mkdir /mnt/raid1
sudo mount /dev/md0 /mnt/raid1
Step 5: Configure fstab
To automatically mount the RAID1 array at boot, you need to edit the /etc/fstab file.
sudo nano /etc/fstab
Add the following line at the end of the file:
/dev/md0 /mnt/raid1 ext4 defaults 0 0
Save and close the file.
Step 6: Move Data
Now, you can move your data from the old HDD to the new RAID1 array.
sudo rsync -a /path/to/old/data /mnt/raid1
Step 7: Update Grub
Finally, update the GRUB bootloader to recognize the new RAID1 array.
sudo update-grub
Summary
This guide showed you how to install RAID1 on a Ubuntu server with a second HDD without wiping everything and reinstalling every single program. The steps include installing mdadm, creating the RAID1 array, formatting it, mounting it, configuring fstab, moving data, and updating Grub.
References