Nt1310 Unit 7

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RAID 1 is only required for two minimum disk drives to implement the mirroring with each other. It has high availability but no data protection. For example, if you delete a file in a mistake, this file also immediately removed from both mirrored disk storage. The same thing also happens if you disk is running by a virus or software bugs, it also can be done in both mirrored copies at the same time. If hackers attack the disk and enter into the disk for stealing the data, they can do both disks. There is no data protection for RAID 1. Therefore, RAID 1 is not a substitute for a backup.
3. Explain the process of data recovery in case of a drive failure in RAID 5.
RAID 5 is using parity technology with at least three disk drives for implementation. The parity technology is to use a bitwise XOR operation to calculate the missing data values when the data is missing in one data disk. The parity disk is recording the sum of the element in each row in data disk. Once the data disk has some data change, the parity disk has to recalculate the sum of the data disk values. The process of data recovery by RAID 5 is like this: when a drive failure, RAID 5 parity disk will calculate out the missing values-, and then Recovery the missing values from other data disks through the calculated results by parity disk.
4. …show more content…
What are the benefits of using RAID 3 in a backup application?
RAID 3 is required minimum of three disk drives which combines strip disks and parity disk. All strip disks access with parallel process, which will write or read all data in the disks completely. The parity disk is for the sum of element values. RAID 3 can help large sequential data backup with a good performance and data protection by parallel and parity technology. The RAID 3 cost is moderate as
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