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Creating and Managing a Software RAID

RAID is used to combine multiple devices into one or more logical units. In this hands-on lab, we are tasked with creating a RAID 5 array, failing active devices and observing the behavior, and adding new devices to the RAID to replace the ones that have failed.

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Path Info

Clock icon Intermediate
Clock icon 30m
Clock icon Jul 24, 2020

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Table of Contents

  1. Challenge

    Create a RAID 5 Array Based on the Instructions

    Use the mdadm command to create the RAID 5 array.

    mdadm -C /dev/md0 -l raid5 -n 3 /dev/xvdf1 /dev/xvdg1 /dev/xvdj1 -x 3 /dev/xvdf2 /dev/xvdg2 /dev/xvdj2

    Create the mdadm.conf file to ensure the RAID is available on boot.

    mdadm -D -s -v > /etc/mdadm.conf
  2. Challenge

    Create an Ext4 Filesystem, Mount It, and Ensure It Persists Through a Reboot

    Use the mkfs command to create an ext4 filesystem on /dev/md0.

    mkfs -t ext4 /dev/md0

    Create the /mnt/raid mount point.

    mkdir /mnt/raid

    Mount /dev/md0 on /mnt/raid.

    mount -t ext4 /dev/md0 /mnt/raid

    Use the blkid command to obtain the UUID of /dev/md0:

    blkid /dev/md0

    Use a text editor to open /etc/fstab and add the following entry at the bottom of the file (using the UUID observed in the previous step):

    UUID=uuid_of_md0    /mnt/raid    ext4    defaults    0 0
  3. Challenge

    Fail the Active Devices in the Array One at a Time and Remove Them

    Fail the active devices using the -f option (Note: Wait until a spare device has been added to the array before proceeding to the next to prevent RAID failure. The state can be checked by running mdadm -D /dev/md0).

    mdadm -f /dev/md0 /dev/xvdf1
    mdadm -f /dev/md0 /dev/xvdg1
    mdadm -f /dev/md0 /dev/xvdj1

    Remove failed devices from the array.

    mdadm -r /dev/md0 /dev/xvdf1 /dev/xvdg1 /dev/xvdj1
  4. Challenge

    Add Three New Devices to the Array Based on the Instructions

    Add new devices to /dev/md0.

    mdadm -a /dev/md0 /dev/xvdf3 /dev/xvdg3 /dev/xvdj3

    Update /etc/mdadm.conf with new configuration changes.

    mdadm -D -s -v > /etc/mdadm.conf

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