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• W1502968909 abstract "The importance of digital information is increasing constantly in today’s society. Digital libraries, Internet applications such email, photo sharing and Web site files often need to be preserved for a long-term and this is a responsability of digital archiving systems. This paper proposes a reliable replication model of immutable digital content to be used in long-term archiving systems. The archiving system is modeled as a set of storage repositories in which independent fail probabilities are assigned. Items are inserted in this system with a reliability that is satisfied replicating them in subsets of repositories. Through simulation, we evaluated three different strategies to create replicas. It is also proposed a totally distributed archiving system using this model over a peerto-peer (P2P) network. The communication between the nodes (repositories) of such network is organized in a distributed hash table and multiple hash functions are used to select repositories that will keep the replicas of each stored item. The system and its algorithms to create replicas are evaluated through experiments in a real environment. We believe that this model and the proposed algorithms, combined with the structured P2P scalability, make possible to construct a reliable and totally distributed digital archiving systems. Resumo. A importância da informacao digital e cada vez maior na sociedade atual. Bibliotecas digitais, aplicacoes na Internet tais como email, compartilhamento de fotos e arquivos de pagina Web frequentemente precisam ser preservados por um longo periodo de tempo e cabem aos sistemas de arquivamento digital tal responsabilidade. Este artigo propoe um modelo de replicacao confiavel de conteudo digital imutavel para ser utilizado em sistemas de arquivamento a longo prazo. O sistema de arquivamento e modelado como um conjunto de repositorios de armazenamento aos quais sao atribuidas probabilidades independentes de falha. Itens sao inseridos neste sistema com uma confiabilidade que e satisfeita replicando-os em subconjuntos de repositorios. Atraves de simulacao, avaliamos tres diferentes estrategias para a criacao das replicas. Tambem e proposto um sistema de arquivamento totalmente distribuido utilizando este modelo sobre uma rede peer-to-peer (P2P). A comunicacao dos nodos (repositorios) desta rede e organizada em uma tabela hash distribuida e multiplas Esta pesquisa foi parcialmente suportada pelo CNPq (Proc. 131068/07-5 e 306624/07–9) funcoes hashs sao utilizadas para selecionar os repositorios que irao guardar as replicas de cada item armazenado. O sistema, junto com seus algoritmos para a criacao das replicas, foi avaliado atraves de experimentos em um ambiente real. Acreditamos que o modelo e os algoritmos propostos, combinados a escalabilidade das redes P2P estruturadas, viabilizam a construcao de sistemas de arquivamento digital confiaveis e totalmente distribuidos." @default.
• W1502968909 created "2016-06-24" @default.
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• W1502968909 date "2009-06-24" @default.
• W1502968909 modified "2023-09-27" @default.
• W1502968909 title "Arquivamento digital a longo prazo baseado em seleção de repositórios em redes peer-to-peer" @default.
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