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In modern RAID-structured storage systems, reliability is guaranteed by the use of parity blocks. But the parity-update overheads upon each write request have become a performance bottleneck of RAID systems. In some ways, an attached log disk is used to improve the write performance by delaying the parity blocks update. However, these methods are data-block-oriented and they need more time to rebuild...
This paper proposes a replication cost model and two greedy algorithms, named GS QoS and GS QoS C1, for replication placements in cloud-based storage systems. The model aims to minimize replication cost with full consideration of quality of user access to storage nodes. Our two algorithms employ a utility measurement to guide placement procedures. Our final experimental results show that 1) GS QoS...
This paper proposes a simple and practical RAID reconstruction optimization scheme, called JOurnal-guided Reconstruction (JOR). JOR exploits the fact that significant portions of data blocks in typical disk arrays are unused. JOR monitors the storage space utilization status at the block level to guide the reconstruction process so that only failed data on the used stripes is recovered to the spare...
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