Torres Berrocal, José E.

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    Elastically replicated information services
    (2004) Torres Berrocal, José E.; Vélez Rivera, Bienvenido; College of Engineering; Seguel, Jaime; Rodríguez Martínez, Manuel; Department of Electrical and Computer Engineering; Gooransarab, Haedeh
    This thesis introduces elastically replicated information systems (ERIS). ERIS aredistributed storage clusters (DSC) capable of sustaining their availability over a thresholdvalue even in the presence of topological changes to the configuration of the system bydynamically adjusting their replication level and object allocation scheme. Suchtopological changes may be caused by external factors such as changes in demand ordynamic repartitioning of resources, but also by internal factors such as storage nodefailures. Various replication methods are reviewed and compared to ERIS. A simplemathematical model of a DSC is introduced which forms the basis of several simulationresults characterizing the availability of various replication schemes in response tochanges in the number of nodes. We present experimental data from a DSC simulatorused to compute the availability of a DSC under alternative replication schemes. Theseresults demonstrate that availability decreases quickly enough to render elastic replicationnecessary even in DSC’s with tens of nodes. The results also validate the hypothesis thatstatic replication levels are not enough to guarantee a sustained level of availability.Finally, we exploit some observed patterns in the results in order to synthesize anelastically replicated scheme and demonstrate its ability to sustain availability above ourtarget level as nodes are added to a DSC.