Exam CV0-003 topic 1 question 15 discussion

Answer is A Since the replication to another identical servers has taken care of high-availability responsibility already, we need to find out which RAID types provide maximum storage capacity. There are N disks with capacity to store X amount of data -- With RAID 5, the equivalent capacity of one drive is used for redundant information. Total storage capacity is (N-1) * X -- With RAID 6, the equivalent capacity of two drives is used for redundant information. Total storage capacity is (N-2) * X -- With RAID 10, the equivalent capacity of a half of total drives is used for redundant information. Total storage capacity is (N/2) * X -- With RAID 50, the minimum equivalent capacity of two drives is used for redundant information. Maximum storage capacity is (N-2) * X With this, RAID 5 is the best choice.

Since the minimum number of required disks for RAID 60 is 8, we'll use 8, 1TB drives for this example. RAID 5 Usable storage = 7 TB RAID 6 Usable Storage = 6 TB RAID 50 Usable Storage = 6 TB RAID 60 Usable Storage = 4 TB This is not debatable, the best RAID to maximize storage is RAID 5. The question asks nothing about performance, only storage.

maximize storage = RAID 5

RAID 10 would be the best choice in this scenario. RAID 10 combines the benefits of RAID 1 (mirroring) and RAID 0 (striping) to provide both redundancy and improved performance. With RAID 10, data is mirrored across multiple drives for redundancy, and then the mirrored sets are striped for performance. This configuration provides good performance and fault tolerance, while maximizing the available storage space. RAID 5 and 6 are good choices for fault tolerance and performance, but they typically use more storage space for parity information. RAID 50 is a combination of RAID 5 and RAID 0, and would not be the best choice if maximizing storage is the most important need.

In regards to storage capacity, RAID 5 will have more usable storage as RAID 6 stores more parity information than RAID 5. Sorage Capacity = RAID 5 More Redundant = RAID 6( RAID 6 can withstand loss of at least two drives while RAID 5 can handle 1) https://petri.com/raid-5-vs-raid-6/#What_are_the_best_use_cases_for_RAID_5

Raid 5 has redundancy and gets more disk efficiency than Raid 6 and 10. Raid 0 has no redundancy.

If the most important need is to maximize storage while ensuring data redundancy, the administrator should choose RAID 6 (Option B). RAID 6 is a type of RAID that provides data redundancy and disk striping across multiple disks. In this setup, data is split across multiple disks and two sets of redundant data are stored. This means that if two disks fail, the data can still be reconstructed. Compared to RAID 5, RAID 6 provides better data redundancy and can sustain the failure of two disks, but at the cost of some additional disk space being reserved for data redundancy. If data redundancy is not a major concern and maximizing storage is the priority, RAID 0 or RAID 10 would be more appropriate. However, these RAID types do not provide data redundancy, so if a disk fails, data will be lost.

Cleary answer is A.