You’re installing two new hard drives into your network-attached storage device. Your director asks that they be put into a RAID solution

Question:- You’re installing two new hard drives into your network-attached storage device. Your director asks that they be put into a RAID solution that offers redundancy over performance

Which would you use?

a.       RAID 0

b.      RAID 1

c.       RAID 5

d.      RAID

e.      RAID 10

The correct answer is b. RAID 1

Explanation:

RAID 1, or disk mirroring is the optimal choice if redundancy and protection of data are higher priorities than overall storage size. RAID 1 involves duplication of data to two or more drives simultaneously. If one drive fails the data is still fully available from other mirrored drives. This offers full redundancy and protection of the drives from failures. This however, means that only 50% of the total storage capacity is really usable because the same data would be duplicated on both drives. For instance, two 1TB drives in a RAID 1 array would represent usable storage of about Mb. Reads can be distributed to both disks resulting in better performance than a single drive. But write performance does not improve significantly because each write must go to both drives. On the one hand, RAID 1 is an excellent redundant and protective solution for critical data; on the other hand it decreases usable storage capacity. For the director’s emphasis on redundancy over performance in this application, RAID 1 is the best solution for these new hard drives to ensure fault tolerance and protection against drive failure .