Improving Availability of RAID-Structured Storage Systems by Workload Outsourcing

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Provided by: Institute of Electrical & Electronic Engineers
Topic: Storage
Format: PDF
Due to the contention for the shared disk bandwidth, the user I/O intensity can significantly impact the performance of the online low-priority background tasks, thus reducing the reliability and availability of RAID-structured storage systems. In this paper, the authors propose a novel and practical scheme, called WorkOut (I/O Workload Outsourcing), to significantly boost the performance of those low-priority background tasks. WorkOut effectively outsources all write requests and popular read requests originally targeted at the degraded RAID set that is performing the low-priority background tasks to a surrogate RAID set.
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