Study plan
RAID Levels, Trade-offs, and Data Integrity in Storage Systems
Learn the key RAID levels, their trade-offs, and the main techniques used to maintain data integrity and protection in storage systems through about four lessons.
Lessons in this plan
-
1
Why RAID Exists: Objectives, Architecture, and Fault Model
Explain why storage systems use RAID for performance, capacity, and reliability; describe the external disk-like interface versus internal RAID components; and identify the fail-stop disk fault model used to reason about RAID behavior.
- 2 Core RAID Levels: RAID 0 and RAID 1 Compare RAID 0 striping and RAID 1 mirroring in terms of layout, performance, capacity efficiency, and fault tolerance, including how striping increases parallelism and how mirroring duplicates writes while enabling recovery from disk failure.
- 3 Parity-Based Protection: RAID 4 and RAID 5 Describe how parity with XOR supports reconstruction after a disk loss, and compare RAID 4 and RAID 5 with respect to space savings, parity placement, and the impact of parity organization on write performance and parallelism.
- 4 Data Integrity Beyond RAID: Latent Sector Errors, Checksums, and Scrubbing Identify major data integrity risks beyond whole-disk failure, including latent sector errors and silent corruption, and explain the main protection techniques of ECC, checksums, redundancy-based recovery, and periodic scrubbing, along with their overheads.