How To Create RAID Arrays with mdadm on Ubuntu 16.04

How To Create RAID Arrays with mdadm on Ubuntu 16.04

How To Create RAID Arrays with mdadm on Ubuntu 16.04

RAID (Redundant Array of Independent Disks) is a technology that combines multiple hard drives into one logical unit. The mdadm utility can be used to create RAID arrays on Ubuntu 16.04.

Prerequisites

To follow this tutorial, you will need:

  • Ubuntu 16.04 installed
  • Two or more hard drives of the same size
  • Basic understanding of the Linux command line

Step 1: Install mdadm

The mdadm utility should already be installed on Ubuntu 16.04. However, if it is not installed, you can install it with the following command:

sudo apt-get update
sudo apt-get install mdadm

Step 2: Identify the Hard Drives

Before creating a RAID array, you need to identify the hard drives you want to use. You can use the following command to list all the available hard drives:

sudo fdisk -l

Make note of the device names for the hard drives you want to use. They will be in the format /dev/sdX, where X is a letter representing the drive.

Step 3: Create the RAID Array

Once you have identified the hard drives, you can create the RAID array. The following command creates a RAID 1 array with two hard drives:

sudo mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sdX /dev/sdY

Replace /dev/sdX and /dev/sdY with the device names for the hard drives you want to use.

You can also create other RAID levels, such as RAID 0 or RAID 5. The level option specifies the RAID level and the raid-devices option specifies the number of hard drives to use.

Step 4: Format the RAID Array

After creating the RAID array, you need to format it with a file system. The following command formats the RAID array with the ext4 file system:

sudo mkfs.ext4 /dev/md0

Replace /dev/md0 with the name of your RAID array.

Step 5: Mount the RAID Array

Finally, you need to mount the RAID array to use it. Create a mount point for the RAID array:

sudo mkdir /mnt/raid

Then mount the RAID array:

sudo mount /dev/md0 /mnt/raid

You can now use the RAID array as you would any other mounted drive.

Conclusion

In this tutorial, you learned how

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