📖 What is RAID 10 (Redundant Array of Independent Disks 10)?
RAID 10 (Redundant Array of Independent Disks 10) combines the mirroring of RAID 1 and the striping of RAID 0. It provides the high performance of striping and the high redundancy of mirroring, requiring a minimum of four disks.
"This is often called a 'stripe of mirrors.' It offers the best of both worlds but is the most expensive in terms of hardware."
📚 Certification: CompTIA A+ Certification Exam Core 1 (220-1101)
🔑 What are the Key Concepts of RAID 10 (Redundant Array of Independent Disks 10)?
- ▸ Known as a stripe of mirrors, RAID 10 mirrors data across pairs of disks first, then stripes that data across the mirrored sets.
- ▸ Provides high fault tolerance, allowing the array to survive multiple drive failures provided that not all drives in a single mirror pair fail.
- ▸ Delivers superior read and write performance by utilizing striping, making it ideal for high-transaction databases and heavily accessed server applications.
- ▸ Requires a minimum of four disks and results in 50% storage efficiency, as half the total capacity is dedicated to mirroring data.
🎯 How does RAID 10 (Redundant Array of Independent Disks 10) appear on the 220-1101 Exam?
A scenario might describe a client needing a server configuration with four drives that prioritizes extreme performance and data safety over total storage capacity. You must identify RAID 10 as the solution.
Expect questions where you must compare RAID 10 to RAID 5, specifically focusing on the trade-off between usable storage space and the superior write performance and faster rebuild speeds of RAID 10.
❓ Frequently Asked Questions
How does RAID 10 differ from RAID 0+1?
RAID 10 mirrors first then stripes, while 0+1 stripes first then mirrors. RAID 10 is generally preferred because it is more resilient and significantly easier to rebuild after a disk failure.
Why choose RAID 10 over RAID 5 for a write-heavy workload?
RAID 5 requires calculating parity for every write operation, which creates a performance bottleneck. RAID 10 avoids this parity overhead, providing much faster write speeds for intensive applications.