What would be the effect on cost and performance if tape storage were to achieve the same areal density as disk storage? (Areal density is the number of gigabits per square inch.)
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- For a 5,000 RPM disk, assume its average seek time is 7 msec, and it has 100 MB/sec bandwidth; assume the sector size is 512 bytes. (In this problem, MB means 1,000,000 bytes.) How long does it take to access 2,048 bytes of contiguous data on average? What is the average throughput (bytes per second) if the user accesses 512 bytes for each I/O? Assume the data is perfectly aligned on the disk. How long does it take to access 1 MB of contiguous data (on average)? What is the average throughput (bytes per second) if the user accesses 1 MB for each I/O operations? Assume the data is perfectly aligned on the disk. Suppose a user expects his or her average throughput to reach 50% of the disk’s maximum bandwidth. Find the minimum I/O size needed to achieve this.What would be the effect on cost and performance if tape storage were to achieve the same areal density as disk storage? (Areal density is the number of gigabits per square inch.)A flash memory of 16 Gbyte is used to store PCM voice data. Suppose that a CT voice signal is sampled at 20 kHz, and each sample is encoded into an 12-bit. How many minutes of the voice signal can be stored (as PCM data) in this memory? If the sampling frequency is doubled, what its impact on storing time? Analyze mathematically
- If you need to design a system for transmitting the output of a minicomputer to a line printer operating at a speed of 30 lines/sec over a voice grade telephone line with a bandwidth of 3 kHz. Assume that the line printer needs 16 bits of data per character and prints out 50 characters per line. What should be the minimum S/N to proceed this transmission?With drawing Compute the Average access time for memory system when the time for Main Memory is 2000 ns, the time for cache is 200 ns and hit ratio is 0.9?Consider a memory system with the following parameters: Tc = 100ns Cc = 0.01 cents/bit Tm = 1,200ns Cm = 0.001 cents/bit a. What is the cost of 1 MByte of main memory? b. What is the cost of 1 MByte of main memory using cache memory technology?
- Suppose that a disk drive rotates at 8000 RPM. It has an average seek time of 4 milliseconds. If its transfer rate is 15 Mbps, determine the average time it takes for a 15K byte request to be transferred from the time the disk starts the seek? From this, determine its throughput.For a 512k x 32-bit memory system, what is the capacity in bytes? Give the exact number. Remember that 512k is shorthand for 524,288. 16,777,216 16,384,000 2,048,000 2,097,152Transfer rate of a disk drive can be no faster than the bit density (bits/track) times the rotational speed of the disk. Figure 7.15 gives a data transfer rate of 112GB/sec. Assume that the average track length of the disk is 5.5 inches. What is the average bit density of the disk?
- Consider a Disk I/O transfer, in which 1500 bytes are to be transferred, but number of bytes on a track is 1000, and rotation speed of disk is 1500 rps but the average time required to move the disk arm to the required track is 15 ms, then what will be total access time?Suppose that a magnetic disk has an average seek time of 4 ms, a rotation rate of 5400 RPM, a transfer rate of 50 MB/second, a sector size of 512 bytes, and controller overhead of 2 ms. What is the average amount of time to read a single sector?6. Examine the systems given below. System (a): 0.88 0.85 0.93 0.95 System (b): 0.95 0.93 0.85 0.83 0.85 a Which system is more reliable, a or b? (show your answer) b. If it costs $800 for each 83% reliable component, $950 for each 85% component, $1,000 for each 88% component, $1100 for each 93% reliable component, $1300 for each 95% reliable component and $7,550 to replace a failed system, which system would you choose, a or b?