DEA-1TT5 RAID and Data Protection 1 — Questions and Answers
Question 1: What does RAID stand for?
- Redundant Array of Independent Disks (Correct answer)
- Rapid Access to Integrated Data
- Resilient Array of Internal Drives
- Redundant Allocation of I/O Data
Correct answer: Redundant Array of Independent Disks
RAID (Redundant Array of Independent Disks) combines multiple physical disks into a logical unit to improve performance, fault tolerance, or both.
Question 2: Which RAID level provides striping without redundancy, offering maximum performance but no fault tolerance?
- RAID 1
- RAID 5
- RAID 0 (Correct answer)
- RAID 6
Correct answer: RAID 0
RAID 0 stripes data across multiple disks for improved performance but provides no redundancy — a single disk failure results in complete data loss.
Question 3: How many disk failures can RAID 6 tolerate?
- 0
- 1
- 2 (Correct answer)
- 3
Correct answer: 2
RAID 6 uses dual distributed parity, allowing the array to survive the simultaneous failure of any two drives without data loss.
Question 4: What is a 'hot spare' in a RAID configuration?
- An extra powered-off disk stored on a shelf
- An idle standby disk that automatically replaces a failed disk in an array (Correct answer)
- A high-performance SSD used as a cache tier
- A spare power supply for the storage controller
Correct answer: An idle standby disk that automatically replaces a failed disk in an array
A hot spare is an unused drive that remains online in the array and automatically begins rebuilding when a drive in a RAID set fails, reducing time in a degraded state.
Question 5: In RAID 5, how is parity information stored?
- On a dedicated parity disk separate from the data disks
- Distributed across all disks in the array (Correct answer)
- Only on the first and last disks
- In the storage controller's NVRAM
Correct answer: Distributed across all disks in the array
RAID 5 distributes parity information evenly across all member disks, eliminating the single-parity-disk bottleneck and allowing any one disk to fail without data loss.
Question 6: What is the primary advantage of RAID 10 over RAID 5?
- RAID 10 has lower storage overhead
- RAID 10 provides better write performance and faster rebuild times due to mirroring (Correct answer)
- RAID 10 can tolerate more simultaneous disk failures
- RAID 10 requires fewer disks to implement
Correct answer: RAID 10 provides better write performance and faster rebuild times due to mirroring
RAID 10 (mirrored stripes) avoids the parity calculation overhead of RAID 5 and rebuilds by copying data from the mirror, resulting in much faster rebuilds and better write performance.
DEA-1TT5 RAID and Data Protection 1
What does RAID stand for?