Only the bolded values (added by Sri) are worth marks.
Time |
Address |
Address in Binary |
Index |
Cache Entry Was Replaced (Yes or No) |
0 |
0 |
|
|
|
1 |
4 |
|
|
|
2 |
16 |
|
|
|
3 |
132 |
|
|
|
4 |
232 |
|
|
|
5 |
160 |
|
|
|
6 |
1024 |
|
|
|
7 |
30 |
|
|
|
8 |
140 |
|
|
|
9 |
3100 |
|
|
|
10 |
180 |
|
|
|
11 |
2180 |
|
|
|
12 |
3505 |
70 |
|
|
13 |
185 |
|
|
|
14 |
869 |
|
|
|
15 |
7041 |
|
|
|
b. Textbook question 5.8 with adjustment by Sri – 4 marks.
Based on section 5.5 in the textbook.
Mean Time Between Failures (MTBF), Mean Time To Replacement (MTTR), and Mean Time To Failure (MTTF) are useful metrics for evaluating the reliability and availability of a storage resource. Explore these concepts by answering the questions about devices with the following metrics.
Item |
MTTF |
MTTR |
MTBF |
Availability |
Smart phone |
3 years |
1 day |
|
|
Any desktop hard drive |
6 years |
2 days |
|
|
Specific desktop hard drive (order through Amazon) |
6 years |
4 days |
|
|
Enterprise SSD with onsite replacement warranty |
167 years |
4 hours |
|
|
Calculate the MTBF for each of the devices in the table by filling in the MTBF column in the chart above.
Calculate the availability for each of the devices in the table by filling in the Availability column in the chart above.
3. a) What happens to availability as the MTTR approaches 0?
b) Is this a realistic situation?
4. a) What happens to availability as the MTTR gets very high, i.e., a device is difficult to repair?
b) Does this imply the device has low availability? (Sri note: This is a real problem with NAS/SAN’s where a ‘drive’ is really a box with many drives in it, and fixing a SAN could require a specialist electronics technician to diagnose the board and solder replacement components on, this has happened at Trent before).
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