Disk Redundancy Research

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NT1230 Unit 2. Assignment 1. Disk Redundancy Research

1. What does RAID stand for? Redundant Array of Independent Disk
2. When would we use Raid? To divide and replicate data into physical drives.
3. Define the following types of RAID:
a. RAID 0-is simply data striped over several disks. This gives a performance advantage, as it is possible to read parts of a file in parallel. However not only is there no data protection, it is actually less reliable than a single disk, as all the data is lost if a single disk in the array stripe fails.
b. RAID 1-is data mirroring. Two copies of the data are held on two physical disks, and the data is always identical. RAID1 has a performance advantage, as reads can come from either disk, and is simple to implement. However, it is expensive, as twice as many disks are needed to store the data.
c. RAID 5-data is written in blocks onto data disks, and parity is generated and rotated around the data disks. Good general performance, and reasonably cheap to implement. Used extensively for general data.
d. RAID 6-is growing in popularity as it is seen as the best way to guarantee data integrity as it uses double parity. It was originally used in SUN V2X devices, where there are a lot of disks in a RAID array, and so a higher chance of multiple failures. RAID6 as implemented by SUN does not have a write overhead, as the data is always written out to a different block.
4. Why is RAID 0 of any use if it offers no redundancy? Fast performs and additional storage.
5. Who do you think that RAID 1 can be the most expensive? Why would people utilize it it’s so costly? You will have to buy additional space. It has increase read performance
6. If you, as home computer user, were to purchase a form of RAID, which would you choose and why? 0 and faster.
7. What is the difference between software RAID and hardware RAID? Cost, Complicity…...

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