MCQ IN COMPUTER SCIENCE & ENGINEERING

Detailed explanation-1: -RAID 0 offers the best performance and capacity but no fault tolerance. Conversely, RAID 1 offers fault tolerance but does not offer any capacity of performance benefits. While performance is an important factor, backup admins may prioritize fault tolerance to better protect data.

Detailed explanation-2: -RAID cannot provide a suitable substitute for backup, but you can use both RAID and backup technology collectively to protect your organization’s data.

Detailed explanation-3: -RAID 1 offers higher reliability because of redundancy; even if one of the drives fails outright, data is still available on the other. However, RAID arrays do not protect data from bit rot-the gradual decay in storage media that causes random bits on the hard drive to flip, corrupting the data.

Detailed explanation-4: -RAID 10 is a combination of RAID 1 and 0 and is often denoted as RAID 1+0. It combines the mirroring of RAID 1 with the striping of RAID 0. It’s the RAID level that gives the best performance, but it is also costly, requiring twice as many disks as other RAID levels, for a minimum of four.

Detailed explanation-5: -RAID level 1 (mirroring) volume layout offers the following: Groups two or more disks as one virtual disk with the capacity of a single disk. Data is replicated on each disk, providing data redundancy. When a disk fails, the virtual disk still works.