How to Set Up RAID 1 on Linux

How to Set Up RAID 1 on Linux

RAID 1, also known as “mirroring,” is a popular method of data protection that duplicates data across multiple drives. This guide will walk you through the process of setting up RAID 1 on your system, including step-by-step instructions, useful commands, similar alternatives, and ideas for automation.

Table of Contents

  1. Overview
  2. Step 1: Check Drive Compatibility
  3. Step 2: Install Required Packages
  4. Step 3: Partition and Format Drives
  5. Step 4: Create RAID 1 Array
  6. Step 5: Mount the RAID Array
  7. Automation Ideas


RAID 1 is a simple and effective way to protect your data against drive failures. It works by mirroring data across two or more drives, ensuring that if one drive fails, the data is still accessible from the remaining drives. Setting up RAID 1 involves partitioning and formatting the drives, creating the RAID array, and mounting it for use.

Step 1: Check Drive Compatibility

Before setting up RAID 1, it’s essential to ensure that your drives are compatible and properly connected. Verify that you have at least two identical drives and that they are connected to your system. You can use the following command to list the connected drives:


This command will display information about all connected drives, including their names (e.g., /dev/sda, /dev/sdb), sizes, and partitions.

Step 2: Install Required Packages

To configure RAID 1, you need to install the appropriate software packages. The most common package used for RAID management is mdadm. Install it using the following command:

sudo apt-get install mdadm

This command will install mdadm and any necessary dependencies on your system.

Step 3: Partition and Format Drives

Now that you have the required packages installed, you can proceed to partition and format the drives for RAID 1. Use the following steps:

  1. Identify the drives you want to use for RAID 1 (e.g., /dev/sda, /dev/sdb).
  2. Partition each drive using a partitioning tool like fdisk or parted. Create a new partition on each drive, ensuring they have the same size.
  3. Format the partitions with the desired file system. For example, to format a partition as ext4, use the command: sudo mkfs.ext4 /dev/sda1. Repeat this step for all partitions.

Step 4: Create RAID 1 Array

With the drives partitioned and formatted, you can now create the RAID 1 array. Use the following command:

sudo mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sda1 /dev/sdb1

This command creates a RAID 1 array named /dev/md0 with two devices (/dev/sda1 and /dev/sdb1). Adjust the command according to your drive names and the number of devices in your array.

Step 5: Mount the RAID Array

After creating the RAID 1 array, you can mount it to a directory on your system for use. Use the following steps:

  1. Create a directory to serve as the mount point. For example, sudo mkdir /mnt/raid1.
  2. Mount the RAID array to the created directory using the command: sudo mount /dev/md0 /mnt/raid1.
  3. Verify that the RAID array is mounted correctly by running the command: df -h. The output should list the mount point and the RAID array.

Automation Ideas

Automating the setup of RAID 1 can save time and effort, especially when working with multiple systems or drives. Here are a few ideas for automating the process:

  • Use a configuration management tool like Ansible or Puppet to automate the installation of required packages and drive partitioning.
  • Create a shell script that accepts drive names and sizes as arguments and automatically formats and configures the RAID 1 array.
  • Explore RAID management tools that provide a graphical interface for easier setup and management.


Setting up RAID 1 is a straightforward process that offers data redundancy and protection against drive failures. By following the steps outlined in this guide, you can easily configure RAID 1 on your system, ensuring the safety of your critical data.

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