Lightweight Dynamic Redundancy Control for Server-Based Storage

Fukatani, Takayuki; Le, Hieu Hanh; Yokota, Haruo

doi:10.1109/srds47363.2019.00042

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…The main parameter of reservation is its multiplicity factor-the ratio of the number of reserving (secondary) devices to the number of reserved (primary) ones [7]. Therefore, multiple reservation is used in cases where it is necessary to ensure high reliability [8]. However, the multiplicity of reservation is limited by weight, dimensions, and cost.…”

Section: Introductionmentioning

confidence: 99%

Switching Order after Failures in Symmetric Protective Electrical Circuits with Triple Modal Reservation

et al. 2021

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This work is devoted to the research of new asymmetry effects in symmetric protective structures with triple modal reservation. We analyzed the structures with different cross-sectional locations of the reference conductor: in the center (unshielded structure), around (shielded structure), at the top and bottom (multilayer printed circuit board), and in the form of side polygons (double-sided printed circuit board). First, a preliminary quasi-static simulation was performed in the range of parameters. It was revealed that in all structures, except for the shielded one (in the form of a cable), the deviations of the output voltage amplitude, bandwidth, and frequency of the first resonance were insignificant, whereas in the shielded structure there were significant deviations in the time and frequency responses. The attenuation of the output voltage in relation to the input for each structure was also estimated. In addition, we performed a parametric optimization of the structures under consideration using a heuristic search, which made it possible to improve their characteristics. Finally, the switching order between the conductors in these structures with the original and optimized parameter sets was investigated in detail. The optimal conductor switching order in the case of a component failure was determined, and the best (according to protective characteristics) parameter configuration for each structure was found.

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Section: Introductionmentioning

confidence: 99%

Switching Order after Failures in Symmetric Protective Electrical Circuits with Triple Modal Reservation

et al. 2021

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Lightweight Dynamic Redundancy Control with Adaptive Encoding for Server-based Storage

Fukatani

Yokota

2021

ACM Trans. Storage

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With the recent performance improvements in commodity hardware, low-cost commodity server-based storage has become a practical alternative to dedicated-storage appliances. Because of the high failure rate of commodity servers, data redundancy across multiple servers is required in a server-based storage system. However, the extra storage capacity for this redundancy significantly increases the system cost. Although erasure coding (EC) is a promising method to reduce the amount of redundant data, it requires distributing and encoding data among servers. There remains a need to reduce the performance impact of these processes involving much network traffic and processing overhead. Especially, the performance impact becomes significant for random-intensive applications. In this article, we propose a new lightweight redundancy control for server-based storage. Our proposed method uses a new local filesystem-based approach that avoids distributing data by adding data redundancy to locally stored user data. Our method switches the redundancy method of user data between replication and EC according to workloads to improve capacity efficiency while achieving higher performance. Our experiments show up to 230% better online-transaction-processing performance for our method compared with CephFS, a widely used alternative system. We also confirmed that our proposed method prevents unexpected performance degradation while achieving better capacity efficiency.

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Lightweight Dynamic Redundancy Control for Server-Based Storage

Cited by 2 publications

References 4 publications

Switching Order after Failures in Symmetric Protective Electrical Circuits with Triple Modal Reservation

Switching Order after Failures in Symmetric Protective Electrical Circuits with Triple Modal Reservation

Lightweight Dynamic Redundancy Control with Adaptive Encoding for Server-based Storage

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