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System and method for reducing data loss in disk arrays by establishing data redundancy on demand
System and method for reducing data loss in disk arrays by establishing data redundancy on demand
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机译:通过按需建立数据冗余来减少磁盘阵列中数据丢失的系统和方法
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摘要
Disclosed is a system and method for reducing data loss in a disk array comprising computing redundant data of the user data in the disk array, periodically storing the computed redundant data into data blocks located on at least one disk; monitoring the disks for a number of concurrent actual and predicted disk failures to occur; determining which portions of the redundant data have been altered since an immediate previous time the redundant data was stored; re-computing altered portions of the redundant data and updating the corresponding data blocks when said number of concurrent disk failures occur and less than a fraction of the redundant data has been altered, reconstructing data stored on a failed disk onto at least one replacement disk; and marking the recomputed redundant data in a directory, wherein the disk array comprises one of the standard RAID arrays.
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