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Identifier uch.csd.msc//2005petraki
Title Αποτίμηση αξιοπιστίας διατάξεων συστημάτων για μακροχρόνια ψηφιακή διατήρηση
Alternative Title Evaluating the reliability of system configurations for long term digital preservation
Creator Petraki, Meropi S
Abstract Digital material is vulnerable to loss and corruption as it is stored in magnetic and optical media that can fail because of exposure to heat, humidity, airborne contaminants or because of faulty reading and writing devices. Organizations whose mission encompasses the preservation of information and cultural heritage have very high reliability requirements for their digital preservation systems. The problem essentially is to achieve given reliability goals with minimal cost. In this work we study the effectiveness of various system configurations for digital preservation by applying analytical modelling techniques to evaluate the reliability of those configurations. The results are useful in supporting such decisions as how many copies to retain for each document, how frequently to check these copies for corruptions, what storage schemes are most effective for data preservation, what strategies are most effective for error recovery and repair, how many sites should be used in order to prevent loss from natural disasters such as flood, fire, earthquake. We have conducted sensitivity analysis of a set of reliability criteria with respect to model parameters in representative cases. Sensitivity analysis has proved especially helpful in finding ‘major’ factors that influence the reliability and cost of each configuration. The examples show that intuition may fail to estimate such factors.
Issue date 2005-04-01
Date available 2005-07-20
Collection   School/Department--School of Sciences and Engineering--Department of Computer Science--Post-graduate theses
  Type of Work--Post-graduate theses
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