Dynamic grid quorum a reconfigurable grid quorum

Authors: Munetoshi Ishikawa Koji Hasebe Akiyoshi Sugiki Kazuhiko Kato

Publish Date: 2010/11/17

Volume: 4, Issue: 4, Pages: 245-260

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Abstract

Powersaving has become a central issue for wellconfigured SOC platforms In particular as a high percentage of the total energy is used by the storage systems the cost effectiveness of data management is equally as important as reliability and availability To address this issue we propose the dynamic grid quorum as a method for reducing the power consumption of largescale distributed storage systems The basic principle of our approach is to skew the workload toward a small number of quorums This can be realized using the following three techniques First our system allows reconfiguration by exchanging nodes without any data migration so that highcapacity nodes can be reallocated to busier quorums Second for more effective skewing of the workload we introduce the notion of dual allocation which makes it possible to consider two distinct allocations in the same grid for write and read quorums Finally we present an optimization algorithm to find a pair of a strategy and an allocation of nodes which minimizes power for a given system setting and its workload We also demonstrate that the dynamic grid quorum saves on average 14–25 energy compared with static configurations when the intensity of the total workload changes

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