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Erasure codes are widely used in practical storage systems to prevent disk failure and data loss. However, these codes require excessive disk I/Os and network traffic for recovering unavailable data. As a result, the recovery performance of erasure codes is suboptimal. Among all erasure codes, Minimum Storage Regenerating (MSR) codes can achieve optimal repair bandwidth under the minimum storage during...
Modern distributed storage systems often store redundant data in multiple replications or erasure coding according to their access frequencies. Multiple replications scheme is well-performance for hot data while erasure coding scheme is storage-efficient for warm and cold data. When hot data turn cold, an encoding procedure starts to do the conversion. However, due to sequential striping, current...
Erasure codes are widely used in distributed storage systems to prevent data loss. Traditional erasure codes suffer from a typical repair-bandwidth problem in which the amount of data required to reconstruct the lost data, referred to as the repair bandwidth, is often far more than the theoretical minimum. While many novel erasure codes have been proposed in recent years to reduce the repair bandwidth,...
Lattice codes can achieve the capacity of additive white Gaussian noise channel with and without power construction. It is well known that lattice codes can provide a classical information theoretic way to obtain achievable rate and performance gains for point-to-point Gaussian channels. The coding scheme based on lattice codes can be used as building blocks for practical applications, such as point-to-point...
Erasure codes are widely used in modern distributed storage systems to prevent data loss and server failures. Regenerating codes are a class of erasure codes that trades storage efficiency and computation for repair bandwidth reduction. However, their non-unified coding parameters and huge computation overhead prohibit their applications. Hence, we first propose a family of Functional Regenerating...
The management of multi-level caching hierarchy is a critical and challenging task. Although there exist many hardware and OS-based schemes, they are difficult to be adopted in practice since they incur non-trivial overheads and high complexity. In order to efficiently deal with this challenge, we propose MERCURY, a cost-effective and lightweight hardware support to coordinate with OS-based cache...
Because most practical communication systems need possessing higher bandwidth efficiency, this article increases the bandwidth efficiency through the two aspects of code rate and modulation mode, that is, by combining CTC(convolutional turbo code) in WiMax protocol with MSK modulation and applying them in the practical communication systems. The simulation result shows the combination of CTC and MSK...
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