Storage systems implementing offset erasure code stripes
摘要
說明書
According to an illustrative approach, which is in no way intended to limit the invention, the high failure rate regions on each storage unit may be mapped to one or more contiguously numbered strips. For instance, if the number of continuously numbered high failure rate region containing strips is greater than 1, these strips are preferably skipped over in selecting the strips from the next storage unit. Therefore, if the number of contiguously numbered high error rate strips is N, strips are selected for stripe “i” from strip “i+N*j.” In other words, the process of selecting strips from each storage unit for the given erasure code stripe includes selecting strips that are each offset from the remaining strips by an amount that is greater than a total number of strips in the high failure rate regions However, in some approaches this may be achieved by actually organizing the selected strips in a desired way, e.g., as will soon become apparent.
