What is the highest percentage of the memory bus capacity that could be consumed by the disk’s DMA if there are 4 disk drives is use?

Computer Networking: A Top-Down Approach (7th Edition)
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Author:James Kurose, Keith Ross
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What is the highest percentage of the memory bus capacity that could be consumed by the disk’s DMA if there are 4 disk drives is use?

2. Bus and memory
Consider a system that has the following characteristics:
•The memory bus runs at 400 MHz.
•The memory bus is 8 bytes wide.
•Accessing a memory address in memory requires 8 memory bus
cycles.
•The disk drives can each read a block every 4 milliseconds.
•Disk blocks read are 8 kilobytes each.
Assume DMA from the disk drive.
What is the highest percentage of the memory bus capacity that could be
consumed by the disk's DMA if there are 4 disk drives in use?
Transcribed Image Text:2. Bus and memory Consider a system that has the following characteristics: •The memory bus runs at 400 MHz. •The memory bus is 8 bytes wide. •Accessing a memory address in memory requires 8 memory bus cycles. •The disk drives can each read a block every 4 milliseconds. •Disk blocks read are 8 kilobytes each. Assume DMA from the disk drive. What is the highest percentage of the memory bus capacity that could be consumed by the disk's DMA if there are 4 disk drives in use?
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