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Which factors are important to sustain the I/O rates of the application within an array? (Select two.)
A. capacity of the disks within the array
B. speed of the disks within the array
C. number of the disks within the array
D. location of the disks within an enclosure
Correct Answer: BC
Explanation/Reference:
Industry Standard Architechture and Technology Rev. 9.31 Study Guide 1 of 2 – Page 249
Array Technology – Module 7
Number of disks in an array
You can increase the I/O bandwidth of an array by adding drives. This addition allows data to be read from or written to a large number of drives simultaneously.
Many customers buy a few large-capacity drives as opposed to a larger number of low-capacity drives because of cost and management concerns and because they do not understand performance implications. Performance can suffer when there are insufficient drive spindles.
The RAID level and the number of drives affect the available I/O bandwidth for a given disk configuration. You must have enough drives (regardless of the drive capacity) to sustain the I/O rates of the application.
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