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Nt1230 Unit 2 Assignment 1

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NT1230
Unit 2 Disk Redundancy

1. RAID stands for Redundant Array of Independent Disks. A way of logically putting multiple disks together into a single array, getting more reliability and faster capabilities. 2. Use RAID if redundancy and reliability are important. If there are problems with your computer RAID will give you more throughputs enabling you to read and write data from multiple drives instead of one. 3. A. RAID 0: Known as stripping. Where data is stored across any number of disks. You can have from two (2) to thirty two (32) physical disks. If one disk fails, all information is lost. There is no redundancy.
B. RAID 1: Known as mirroring. Data is written identically across all drives in the array. Used mainly for redundancy. No data will be lost if a drive fails. You must have two (2) disks.
C. RAID 5: Data is split over three or more discs, in a way that protects the data if any of the discs fail. Parity is stored on all of the discs in the drive array, which means that if one disc fails, you won't lose all of your information. Reading is faster since the data has more drives to read from. Writing is a downfall due to the fact that the data has to be compared and processed in order to create the parity. Must have 3 disk minimum and from 8 to 16 maximum.
D. RAID 6: Is like RAID 5 with the stripping and parity across the array of disks but adds a second set of parity information for each block of data. Level-6 requires a minimum of four drives and supports a maximum of 16 drives.
4. RAID 1 is useful when it comes to performance. Since the data is written across the array it is broken down into smaller pieces which can be read in parallel thereby increasing bandwidth. Since there is no redundancy it is not advised to use when the data is important, one lost drive loses all the data.
5. RAID 1 is so costly because you have basically two hard drives, double of everything. However after losing data and having to replace it will also become costly. For the people who are worried about losing data and crashing their system would appreciate RAID 1. I think if truly matters what is most important to you is where cost effectiveness comes in play.
6. I would probable choose RAID 5. I would have the speed with the stripping allowing me to be more efficient and having the parity will give me a sense of security enabling me to not lose my data.
7. Software RAID uses the system's processor, exploit host memory, compromise reliability and potentially rob the system of as much as 60% of its CPU cycles just to process RAID calculations. All AMCC 3ware RAID controllers incorporate onboard processors to deliver true hardware RAID.

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