A server administrator is configuring 10 web servers, each of which can contain up to four hard disks.
To get the HIGHEST level of redundancy for these servers, the administrator should:
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A. B. C. D.C.
The highest level of redundancy for the 10 web servers with up to four hard disks each would be achieved by configuring them with a RAID 10 array, which is also known as a RAID 1+0 or striped mirror array.
RAID stands for Redundant Array of Independent Disks, and it is a technology that allows multiple hard disks to be combined into a single logical unit for the purposes of redundancy, performance, or both.
There are several different types of RAID arrays, each with its own strengths and weaknesses. The four types of RAID arrays listed in the answer choices are as follows:
A. RAID 0: This type of array uses striping to write data across multiple disks simultaneously, which can improve performance but does not provide any redundancy. If any one of the disks in the array fails, all of the data on the entire array is lost.
B. RAID 5: This type of array uses striping and parity to provide redundancy, which means that if one of the disks in the array fails, the data can be reconstructed from the remaining disks. However, this type of array is less reliable than RAID 6 and has lower write performance.
C. RAID 6: This type of array is similar to RAID 5 but uses two sets of parity information instead of one, which provides greater redundancy and allows for up to two disk failures without data loss. However, this type of array has lower write performance than RAID 5.
D. RAID 10: This type of array combines striping and mirroring to provide both high performance and high redundancy. In a RAID 10 array, the data is striped across multiple mirrored pairs of disks, which means that if one of the disks in a pair fails, the data can be reconstructed from the mirror. This type of array provides the highest level of redundancy and performance, but it also requires a large number of disks.
Given that the administrator has up to four disks per web server, the RAID 10 configuration would be ideal because it offers the highest level of redundancy while still maintaining good performance. Specifically, the administrator could configure each web server with four hard disks in two mirrored pairs, and then stripe the data across those pairs. This would provide redundancy in case one or two disks failed, and it would also allow for high read and write performance.