Development of mechanisms to ease the study and selection of distributed file storage techniques in muticloud computing envieronments

Author(s)

Rafael Mira de Oliveira Libardi

• Document type: Master's Dissertation
• Press: São Carlos.
• Institution: Universidade de São Paulo (USP). Instituto de Ciências Matemáticas e de Computação (ICMC/SB)
• Defense date: 2015-11-11

Examining board members

Júlio Cezar Estrella; Cesar Augusto Cavalheiro Marcondes; Paulo Sergio Lopes de Souza

• Advisor: Júlio Cezar Estrella

Abstract

Data and file storage is moving to the Internet using the cloud approach. However, this process still creates issues related to security and availability. This project creates an abstraction layer among several public storage servers, without the need for additional infrastructure, enabling regular users to use a distributed storage method with increased redundancy and security comparing to current techniques. Another important aspect of this project was to create a tool flexible enough to be easy for other researchers to evaluate new dispersal techniques. The first contribution was a prototype named FlexSky, which implements the studied dispersal mechanisms. Due to the big amount of parameters to choose from during the dispersal process, it was needed to develop a mechanism to reduce the amount of user input parameters so a regular user can use the tool. This mechanism was the second contribution (MSSF) and it is composed of a model based on integer linear optimization that automatically selects multicloud dispersal strategies. The evaluation phase was composed of qualitative usability tests and quantitative performance tests. The results suggests that the FlexSky tool made the study of dispersal mechanisms easier and enables to evaluate their performance. MSSF results shown that using QoS attributes, MSSF can choose an optimal dispersal strategy which maximizes and minimizes the required QoS attributes considering several modules and providers. (AU)

• FAPESP's process: 13/05567-9 - Mechanisms for high availability and security of distributed storage files in cloud computing environment
• Grantee: Rafael Mira de Oliveira Libardi
• Support Opportunities: Scholarships in Brazil - Master