Masking Defective Bits in a Storage Array

摘要

A method of failure mapping is provided. The method includes distributing user data throughout a plurality of storage nodes through erasure coding, wherein the plurality of storage nodes are housed within a chassis that couples the storage nodes as a storage cluster. Each of the plurality of storage nodes has a non-volatile solid-state storage with flash memory or other types of non-volatile memory and the user data is accessible via the erasure coding from a remainder of the plurality of storage nodes in event of two of the plurality of storage nodes being unreachable. The method includes determining that a non-volatile memory block in the memory has a defect and generating a mask that indicates the non-volatile memory block and the defect. The method includes reading from the non-volatile memory block with application of the mask, wherein the reading and the application of the mask are performed by the non-volatile solid-state storage.

主权项

1. A method of failure mapping, comprising:
distributing user data throughout a plurality of storage nodes through erasure coding, wherein the plurality of storage nodes are housed within a chassis that couples the storage nodes as a storage cluster, wherein each of the plurality of storage nodes has a non-volatile solid-state storage with non-volatile memory; determining that the non-volatile memory has a defect; generating a mask that indicates the defect, the generating based on error correction of reads of the non-volatile solid-state storage, wherein the mask is one of a plurality of masks in a mask hierarchy in the storage cluster; and reading from the non-volatile memory with application of the mask, wherein the reading and the application of the mask are performed by the non-volatile solid-state storage.