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Improving the efficiency of Multi-Cloud storage

2025Dissertação de mestrado Acesso aberto
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dc.contributor.authorSantos, Guilherme Dias
dc.contributor.institutionFaculty of Sciences
dc.contributor.institutionDepartment of Informatics
dc.contributor.supervisorBessani, Alysson Neves
dc.date.accessioned2026-01-19T18:00:01Z
dc.date.available2026-01-19T18:00:01Z
dc.date.issued2025
dc.descriptionTese de Mestrado, Engenharia Informática, 2025, Universidade de Lisboa, Faculdade de Ciências
dc.description.abstractCloud storage services need to provide data reliability and availability. While replication provides these two properties, it requires significant storage overhead. Erasure codes can reduce this overhead while increasing reliability and availability of the stored data, as demonstrated in systems like CHARON. In collaboration with the VAWLT platform, this work focuses on improving multi-cloud storage efficiency with erasure coding techniques and Byzantine quorum systems. In particular, it proposes a novel method to distribute data across multiple cloud providers that reduces storage overhead compared to existing approaches. This method is implemented in an improved version of the CHARON protocol, which the VAWLT platform currently uses for multi-cloud storage. Finally, this work studies the state-of-the-art of erasure coding schemes and their implementation in multicloud environments, focusing on alternatives to Reed-Solomon codes for better performance and reduced storage costs.en
dc.formatapplication/pdf
dc.identifier.tid204174023
dc.identifier.urihttp://hdl.handle.net/10400.5/116719
dc.language.isoeng
dc.subjectByzantine quorum systems
dc.subjectErasure codes
dc.subjectCloud Storage
dc.titleImproving the efficiency of Multi-Cloud storageen
dc.typemaster thesis
dspace.entity.typePublication
rcaap.rightsopenAccess

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