CompTIA Tech+ (FC0-U71)InfrastructureHard
A technician is setting up a new server that requires highly resilient storage for critical database files. The solution must tolerate the failure of up to TWO drives simultaneously without data loss. Which RAID level would meet this requirement?
- ARAID 5
- BRAID 1
- CRAID 6
- DRAID 0
Show answer & explanationAnswer & explanation
Correct answer: C. RAID 6
RAID 6 provides fault tolerance against the failure of any two drives simultaneously. It achieves this by using dual parity, distributing two independent parity blocks across all drives in the array. This makes it suitable for critical applications requiring higher data redundancy than RAID 5.
Why the other options are wrong
- A. RAID 5 (striping with single parity) can only tolerate the failure of a single drive.
- B. RAID 1 (mirroring) tolerates the failure of one drive per mirrored pair. If two drives fail, it depends on which ones, but it doesn't inherently guarantee two-drive fault tolerance across the entire array in all scenarios.
- D. RAID 0 (striping) offers no fault tolerance; the failure of any single drive results in data loss.
RAID 6 (Striping with Double Parity)
A RAID level that provides data striping with two independent parity blocks distributed across all drives, allowing the array to continue operating even after the failure of any two drives.
- Requires a minimum of 4 drives.
- Offers very high data redundancy (tolerates two drive failures).
- Has higher write overhead than RAID 5 due to double parity calculations.
- Used for critical applications where maximum uptime and data integrity are paramount.
Memory trick: RAID 6: Two shields strong, data lives on.