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• W2018478911 abstract "We present a power-efficient scheme for erasure-coded storage clusters---ECS 2 ---which aims to offer high energy efficiency with marginal reliability degradation. ECS 2 utilizes data redundancies and deferred writes to conserve energy. In ECS 2 parity blocks are buffered exclusively in active data nodes whereas parity nodes are placed into low-power mode. ( k + r , k ) RS-coded ECS 2 can achieve ⌈( r + 1)/2⌉-fault tolerance for k active data nodes and r -fault tolerance for all k + r nodes. ECS 2 employs the following three optimizing approaches to improve the energy efficiency of storage clusters. (1) An adaptive threshold policy takes system configurations and I/O workloads into account to maximize standby time periods; (2) a selective activation policy minimizes the number of power-transitions in storage nodes; and (3) a region-based buffer policy speeds up the synchronization process by migrating parity blocks in a batch method. After implementing an ECS 2 -based prototype in a Linux cluster, we evaluated its energy efficiency and performance using four different types of I/O workloads. The experimental results indicate that compared to energy-oblivious erasure-coded storage, ECS 2 can save the energy used by storage clusters up to 29.8% and 28.0% in read-intensive and write-dominated workloads when k = 6 and r = 3, respectively. The results also show that ECS 2 accomplishes high power efficiency in both normal and failed cases without noticeably affecting the I/O performance of storage clusters." @default.
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• W2018478911 date "2013-07-01" @default.
• W2018478911 modified "2023-10-11" @default.
• W2018478911 title "Exploiting Redundancies and Deferred Writes to Conserve Energy in Erasure-Coded Storage Clusters" @default.
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• W2018478911 doi "https://doi.org/10.1145/2491472.2491473" @default.
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