Nt1210 Assignment 1 Essay

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NT 1230 | Assignment 1: Disk Redundancy Research | Mr. Brockman | 7-13-2015 | 1.) What does RAID stand for? RAID stands for either redundant array of independent disks or redundant array of inexpensive disks. (Natarajan, 2010) 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: RAID 0: RAID 0 has no mirror or parity. RAID 0 must have at least two disks. (Natarajan, 2010) 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. (Natarajan, 2010) 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. (Natarajan, 2010) 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. (Murrel, 2007) There are other RAID levels: 2, 3, 4, 7, 0+1...but they are really variants of the main RAID configurations already mentioned, and they're used for specific cases. Here are some short descriptions of each: •RAID 2 is similar to RAID 5, but instead of disk striping using parity, striping occurs at the bit-level. RAID 2 is seldom deployed because costs to implement are usually prohibitive (a typical setup requires 10 disks) and gives poor performance with some disk I/O operations. •RAID 3 is also similar to RAID 5, except this solution requires a dedicated parity drive. RAID 3 is seldom used except in the most specialized database or processing environments, which can benefit from it. •RAID 4 is a configuration in which disk striping happens at the byte level, rather than at the bit-level as in RAID 3. •RAID 7 is a proprietary level of RAID owned by the now-defunct Storage Computer

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