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A METHOD FOR PROVIDING PARITY IN A RAID SUB-SYSTEM USING A NON-VOLATILE MEMORY

机译:一种使用非易失性存储器在RAID子系统中提供奇偶校验的方法

摘要

The present invention is a method for providing error correction for an array of disks (828) using non-volatile random access memory (NV-RAM) (816). Non-volatile RAM (816) is used to increase the speed of RAID recovery from a disk error(s). This is done by listing of all blocks for which the parity is possibly inconsistent. This list of blocks is much smaller than the total number of parity blocks (820) in the RAID. The total number of parity blocks (820) in the RAID (828) is in the range of hundreds of thousands. Knowledge of the number of parity blocks that are possibly inconsistent makes it possible to fix only those few blocks, identified in the list, resulting in a significant time savings. The technique for safely writing to a RAID with a broken disk is complicated. In this technique, data that can become corrupted is copied into NV-RAM (816) before the potentially corrupting operation is performed.
机译:本发明是一种使用非易失性随机存取存储器(NV-RAM)(816)为磁盘阵列(828)提供纠错的方法。非易失性RAM(816)用于提高RAID从磁盘错误中恢复的速度。通过列出所有奇偶校验可能不一致的块来完成此操作。该块列表远小于RAID中奇偶校验块的总数(820)。 RAID(828)中的奇偶校验块(820)的总数在数十万个范围内。知道可能不一致的奇偶校验块的数量使得可以仅修复列表中标识的那几个块,从而节省了大量时间。用损坏的磁盘安全地写入RAID的技术很复杂。在该技术中,可以在执行潜在破坏操作之前将可以破坏的数据复制到NV-RAM(816)中。

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