Nt1230 Unit 2 Assignment 1 Disk Redundancy Research

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NT1230 Unit 2 Assignment 1 Disk Redundancy Research 1. What does RAID stand for? RAID stands for either redundant array of independent disks or redundant array of inexpensive disks. 2. When would we use RAID? You would use RAID when you have a lot of important data that you are constantly changing and need to back up often. 3. Define the following types of RAID: a. RAID 0: RAID 0 has striped blocks and has no redundancy (no mirror or parity). RAID 0 must have at least two disks. b. RAID 1: RAID 1 has mirrored blocks and has the best performance of the four because it isn’t striped like RAID 0 and has no parity. Also like RAID 0 RAID 1 needs to have a minimum of two disks. c. RAID 5: RAID 5 has striped blocks like RAID 0 but unlike a,b, and c RAID 5 has distributed parity and needs a minimum of three disks. d. RAID 6: RAID 6 is RAID 5 except when making RAID 6 they added another strip to deal with RAID 5’s major drawback it was useless after two disks went down. 4. Why is RAID 0 of any use if it offers no redundancy? Even though RAID 0 offers no redundancy it still backs up all of your data, and has the best performance as well as the fastest bandwidth. 5. Why do you think that RAID 1 can be the most expensive? Why would people utilize it if it’s so costly? RAID 1 is the most expensive because its disk overhead requires all of its drives to be running. Its 100% redundancy means that no data will be lost. 6. If you, as a home computer user, were to purchase a form of RAID, which would you choose and why? It all depends on what purpose I would need to use RAID for. If had a type of high traffic situation I would use RAID 5, RAID 0 with a high speed situation, and RAID 1 if I needed high availability. 7. What is the difference between software RAID and hardware RAID?

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