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You are developing a storage system for a application that demands unusually high reliability, so you have decided to use a three-replica durable storage scheme. You plan to use three ordinary disk drives D1, D2, and D3, and arrange that D2 and D3 store identical mirror copies of each block stored on D1. The disk drives are of a simple design that does not report read errors. That is, they just return data, whether or not it is valid.
10.1a. You initially construct the application so that it writes a block of data to the same sector on all three drives concurrently. After a power failure occurs during the middle of a write, you are unable to reconstruct the correct data for that sector. What is the problem?
10.1b. Describe a modification that solves this problem.
10.1c. One day there is a really awful power glitch that crashes all three disks in such a way that each disk corrupts one random track. Fortunately, the system wasn't writing any data at the time. Describe a procedure for reconstructing the data and explain any cases that your procedure cannot handle.
1.) Draw a Context Diagram and a Diagram 0 Data Flow Diagram that represents the information system at a typical library. 2.) On the internet, locate at least three firms that offer CASE tools as shareware or free, public domain software. Describe ..
Create the logic for a program that continuously prompts the user for a numeric number of dollars until the user enters 0
1. determine the number of distinct labelling of knn. do the same for kmm and kmnl2. give an example of a graph g with
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Atmospheric air at a velocity of 61 m/s and a temperature of 16°C enters a 0.61-m-long square metal duct of 20-cm x 20-cm cross section. If the duct wall is at 149°C, determine the average heat transfer coefficient. Comment briefly on the LD/h eff..
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The confidentiality, integrity, availability (CIA) triad represents generic security goals. CIA is typically applied to specific areas of information technology as a metric or guideline for establishing or maintaining security.
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The IEEE 802.3u standard identifies which of the following baseband technologies
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