A Reliable and Fast Data Recovery in a Digital Tachograph
The digital tachograph is a device that automatically records driving activities such as vehicle speed, driving distance, break status, transmission, engine RPM, longitude and latitude, accumulated distance, etc. Digital tachographs are mandatory for all trucks by European Commission regulation from 2005. In South Korea, digital tachographs are mandatory for all new business vehicles from 2011 and are being installed in the wider range of vehicles year by year. This device analyses drivers’ driving style and car accidents. A car accident makes the reliability of the device unpredictable, thus it is very important to reliably store driving information and recover it from an accident. We designed and implemented a practical digital tachograph to reliably store data and quickly recover it even after an accident. This paper presents a tiered storage scheme that consists of a first storage device with small capacity at a high reliability and a second storage device with large capacity at a low cost. This tiered architecture provides a high reliability and fast recovery time for an embedded storage. In addition, we present a reverse first-page scanning scheme that overcomes the slow scanning time of log-structured storages at the boot stage. The scheme reduced the scanning time of the first storage device by 1/28 times. In addition, our design includes a scheme that fast stores data at a moment of accident by 1/25 of data transfer time of a normal method.
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Document Type: Research Article
Affiliations: Department of Computer System Engineering, Jungwon University, 28024, South Korea
Publication date: November 1, 2016
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