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In this paper, we investigate the effect of incorrect disk replacement service on the availability of data storage systems. To this end, we first conduct Monte Carlo simulations to evaluate the availability of disk subsystem by considering disk failures and incorrect disk replacement service. We also propose a Markov model that corroborates the Monte Carlo simulation results. We further extend the...
Archival data storage systems contain data that must be preserved over long periods of time but which are often unlikely to be accessed during their lifetime. The best strategy for such systems is to keep their disks powered-off unless they have to be powered up to access their contents, to reconstruct lost data, or to perform other disk maintenance tasks. Of all such tasks, reconstructing data after...
One recent technical challenge facing the designers of erasure-coded storage systems is how to prevent silent data corruptions from propagating during data reconstruction. This paper proposes a new technique of exploiting erasure-coded storage systems to cope with silent data corruptions during data reconstruction. To develop a data reconstruction method that can prevent silent data corruptions from...
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...
The low-cost disk drives, which are increasingly being adopted in today's data storage systems, have higher capacity but lower reliability, which leads to more frequent rebuilds and to a higher risk of unrecoverable or latent media errors. An intra-disk redundancy scheme has been proposed to cope with such errors and enhance the reliability of RAID systems. Empirical field results recently reported...
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