What is the main purpose of using RAID configuration in storage systems?

The main purpose of RAID (Redundant Array of Independent Disks) is to increase data reliability and/or performance by combining multiple physical disks into a single logical array. Depending on the RAID level, you can achieve:

• Increased fault tolerance (e.g., RAID 1 — mirroring data)
• Increased read/write speed (e.g., RAID 0 — striping)
• A balance between performance and reliability (e.g., RAID 5, RAID 6)

Thus, RAID helps protect data from loss due to disk failures and improves overall storage system performance.