How to setup RAID 1 on LINUX Server

RAID 1 consists of an exact copy of a set of data on two or more disks; a classic RAID 1 mirrored pair contains two disks. This configuration offers no parity, striping, or spanning of disk space across multiple disks, since the data is mirrored on all disks belonging to the array, and the array can only be as big as the smallest member disk. This layout is useful when read performance or reliability is more important than write performance or the resulting data storage capacity.


How to setup RAID 1 on LINUX

This article contains steps which give you the glance about “How to setup RAID 1 on your Linux server”. Things you will need:

  • More than one hard disk installed on your system.
  • Basic knowledge of Linux filesystem in case you come across any errors.Raid 1

So here is the step by step guide to setup RAID 1 on your system/server:

  • First, check the hard disks attached to the system using the command fdisk –l.

Here is what the output should look like.


  • Create a RAID 1 partition:  Type mdadm –create /dev/md1 –level=1 –raid-devices=2 /dev/sdg /dev/sdh.

NOTE: replace “sdg” and “sdh” with the names of the hard disk on your server that you want to add in RAID.


  • Create an ext4 filesystem for the RAID 1 partition: mke2fs  –t  -ext4  -j  /dev/md1.
  • Make directory for RAID1 partition: mkdir /raid1.
  • Mount the RAID1 partition on the directory: mount  /dev/md1  /raid1.
  • Edit the fstab file: vi  /etc/fstab.
    This is what the file should look like.Raid1
  • Find an empty line and type ##RAID## and hit enter.
  • Make a new entry: Type   /dev/md1   /raid1   ext4 defaults 1  2.NOTE: Type it the way shown in the highlighted section of the image below.

  • Save changes to file and exit by typing:   :wq
  • Mount the contents of the fstab file: Make sure you have exited the fstab file and you are back at the terminal then type: mount –a.
  • To see the RAID partition that you have just created type: df –h

    That’s all you need to setup RAID 1 on your server. Thanks for sticking with us through the article, hope this article helped. Stay tuned for more on

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