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Reducing read errors by performing mitigation reads to blocks of non-volatile memory

机译:通过对非易失性存储器块执行缓解读取来减少读取错误

摘要

A data storage system includes a non-volatile memory array controlled by a controller that records a number of a plurality of like operations targeting a first block among a plurality of blocks in the non-volatile memory array. In response to the number of the plurality of like operations satisfying a threshold, the controller initiates a mitigation read request by recording an identifier of a second block in a high priority request in a mitigation data structure. The controller initiates other mitigation read requests by recording identifiers of other blocks of the non-volatile memory in low priority requests in the mitigation data structure. The controller preferentially services the high priority request from the mitigation data structure over the low priority requests, where servicing the high priority request includes performing a mitigation read to the second block.
机译:数据存储系统包括由控制器控制的非易失性存储器阵列,该控制器记录了针对非易失性存储器阵列中的多个块中的第一块的多个类似操作。响应于多个相似操作的数量满足阈值,控制器通过将第二块的标识符记录在缓解数据结构中的高优先级请求中来发起缓解读取请求。控制器通过将非易失性存储器的其他块的标识符记录在缓解数据结构中的低优先级请求中来发起其他缓解读取请求。控制器优先于来自缓解数据结构的高优先级请求服务于低优先级请求,其中服务于高优先级请求包括执行对第二块的缓解读取。

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