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RAID Configuration

Learn how to configure and manage software RAID on Linux using mdadm, including RAID 1 mirroring, RAID 5 with parity, array monitoring, simulated disk failure, and recovery.

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Overview

In this lab, you will learn how to configure software RAID on Linux using mdadm and virtual disk images that simulate physical drives. You will create a RAID 1 mirrored array and format it with ext4, mount the array, and verify data availability. You will then simulate a disk failure, inspect the degraded array, remove and re-add the faulty device, and observe re-synchronization. Finally, you will create a RAID 5 array and inspect its configuration and status.

Learning Outcomes

  • Install mdadm and prepare virtual disk images using loop devices.
  • Create and inspect a RAID 1 array using mdadm --create and mdadm --detail.
  • Format a RAID array with ext4, mount it, and create test files.
  • Monitor RAID synchronization and array health using /proc/mdstat.
  • Simulate a disk failure and inspect the array's degraded state.
  • Remove a faulty device from a RAID array and add it back to observe recovery behavior.
  • Create and inspect a RAID 5 array using three simulated disk devices.

Key Concepts

  • Software RAID: Manage redundant storage arrays using Linux software RAID tools.
  • RAID 1: Mirror data across two devices to provide redundancy.
  • RAID 5: Distribute data and parity across at least three devices to provide fault tolerance.
  • Array monitoring: Inspect RAID configuration, synchronization, and device status using mdadm and /proc/mdstat.
  • Degraded arrays: Understand how a RAID 1 array behaves when a member device is marked faulty.
  • Device replacement and recovery: Practice removing and re-adding a device to observe recovery and re-synchronization.
  • Filesystem integration: Format and mount a RAID device with ext4 and verify that test data remains readable after a simulated failure.

Why Needed?

  • Software RAID helps Linux administrators implement storage redundancy and improve resilience to disk failures.
  • Understanding RAID levels helps administrators select suitable storage configurations for different requirements.
  • Monitoring array health and practicing recovery procedures helps build confidence in storage troubleshooting.
  • These hands-on exercises develop practical storage administration skills relevant to LFCS preparation and real-world Linux environments.