As we have seen, a potential drawback of SSDs is that the underlying flash memory can wear out. For example, for the SSD in (Figure 1), Intel guarantees about 128 petabytes (128×1015128×1015 bytes) of writes before the drive wears out. Given this assumption, estimate the lifetime (in years) of this SSD for the following workloads: Worst case for sequential writes: The SSD is written to continuously at a rate of 470 MB/sMB/s (the average sequential write throughput of the device). Express your answer as an integer. Worst case for random writes: The SSD is written to continuously at a rate of 303 MB/sMB/s (the average random write throughput of the
As we have seen, a potential drawback of SSDs is that the underlying flash memory can wear out. For example, for the SSD in (Figure 1), Intel guarantees about 128 petabytes (128×1015128×1015 bytes) of writes before the drive wears out. Given this assumption, estimate the lifetime (in years) of this SSD for the following workloads: Worst case for sequential writes: The SSD is written to continuously at a rate of 470 MB/sMB/s (the average sequential write throughput of the device). Express your answer as an integer. Worst case for random writes: The SSD is written to continuously at a rate of 303 MB/sMB/s (the average random write throughput of the
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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As we have seen, a potential drawback of SSDs is that the underlying flash memory can wear out. For example, for the SSD in (Figure 1), Intel guarantees about 128 petabytes (128×1015128×1015 bytes) of writes before the drive wears out. Given this assumption, estimate the lifetime (in years) of this SSD for the following workloads:
Worst case for sequential writes: The SSD is written to continuously at a rate of 470 MB/sMB/s (the average sequential write throughput of the device).
Express your answer as an integer.
Worst case for random writes: The SSD is written to continuously at a rate of 303 MB/sMB/s (the average random write throughput of the device).
Express your answer as an integer.
Average case: The SSD is written to at a rate of 20 GB/dayGB/day (the average daily write rate assumed by some computer manufacturers in their mobile computer workload simulations).
Express your answer as an integer.
Transcribed Image Text:Reads
Writes
Sequential read throughput
Random read throughput (IOPS)
Random read throughput (MB/s)
550 MB/s
Sequential write throughput
Random write throughput (IOPS)
Random write throughput (MB/s)
Avg. sequential write access time
470 MB/s
89,000 IOPS
74,000 IOPS
365 MB/s
303 MB/s
Avg. sequential read access time
50 μs
60 us
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