What is a key factor for ensuring data availability even during multiple hard drive failures?

What is a key factor for ensuring data availability even during multiple hard drive failures?

• A. Daily backups
• B. RAID 1
• C. RAID 5
• D. RAID 10

Answer: (D)

To ensure data availability during multiple hard drive failures, RAID 10 is a highly effective strategy. RAID 10, also known as RAID 1+0, combines the benefits of both mirroring and striping. This configuration mirrors data across pairs of drives (like RAID 1), which provides redundancy. Additionally, it stripes the data across multiple mirrored sets, enhancing performance. The strength of RAID 10 lies in its ability to withstand multiple failures, as long as the failed drives are not from the same mirror set. For instance, if one drive in a mirror pair fails, the data remains accessible on the other drive in the pair. This configuration allows for higher fault tolerance compared to other RAID levels, meaning data remains available even during the failure of more than one drive, increasing overall system reliability. Other options, while providing some level of data protection or performance, do not offer the same degree of resilience against simultaneous drive failures as RAID 10 does.

To ensure data availability during multiple hard drive failures, RAID 10 is a highly effective strategy. RAID 10, also known as RAID 1+0, combines the benefits of both mirroring and striping. This configuration mirrors data across pairs of drives (like RAID 1), which provides redundancy. Additionally, it stripes the data across multiple mirrored sets, enhancing performance.

The strength of RAID 10 lies in its ability to withstand multiple failures, as long as the failed drives are not from the same mirror set. For instance, if one drive in a mirror pair fails, the data remains accessible on the other drive in the pair. This configuration allows for higher fault tolerance compared to other RAID levels, meaning data remains available even during the failure of more than one drive, increasing overall system reliability.

Other options, while providing some level of data protection or performance, do not offer the same degree of resilience against simultaneous drive failures as RAID 10 does.