MCQ IN COMPUTER SCIENCE & ENGINEERING

Detailed explanation-1: -When two disks fail, all the associated data is lost in RAID 5, whereas RAID 6 can handle a two-disk failure well. However, all information will be lost in RAID 6 when three or more disks fail.

Detailed explanation-2: -Both RAID 5 and RAID 6 are fault tolerant systems. i.e., data is not lost even when one of the physical disks fails. RAID 5 can tolerate the failure of any one of its physical disks while RAID 6 can survive two concurrent disk failures.

Detailed explanation-3: -The downside to RAID 5 is that it can only withstand one disk drive failure. Thankfully, RAID 5 is hot-swappable, meaning one disk drive can be replaced while the others in the array remain fully functional.

Detailed explanation-4: -The primary difference between RAID 5 and RAID 6 is that a RAID 5 array can continue to function following a single disk failure, but a RAID 6 array can sustain two simultaneous disk failures and still continue to function. RAID 6 arrays are also less prone to errors during the disk rebuilding process.

Detailed explanation-5: -RAID 6 uses two parity stripes, the practice of dividing data across the set of hard disks or SSDs, on each disk. It allows for two disk failures within the RAID set before any data is lost.