Which RAID level provides mirroring for redundancy but no performance improvement?

Which RAID level provides mirroring for redundancy but no performance improvement?

• A. RAID 1
• B. RAID 0
• C. RAID 5
• D. RAID 6

Answer: (A)

RAID 1 is the setup that mirrors data on a second drive, providing redundancy so you can continue if one disk fails. Because every write has to go to both drives, there isn’t a real speed-up for writes, so you don’t gain performance. You might see a small read improvement since reads can come from either disc, but the main benefit is fault tolerance, not speed. The other RAID levels either have no redundancy (striping) or use parity to recover data, which affects performance differently.

RAID 1 is the setup that mirrors data on a second drive, providing redundancy so you can continue if one disk fails. Because every write has to go to both drives, there isn’t a real speed-up for writes, so you don’t gain performance. You might see a small read improvement since reads can come from either disc, but the main benefit is fault tolerance, not speed. The other RAID levels either have no redundancy (striping) or use parity to recover data, which affects performance differently.