Chunk segment recovery via hierarchical erasure coding in a geographically diverse data storage system

摘要

Recovery of chunk segments stored via hierarchical erasure coding in a geographically diverse data storage system is disclosed. Chunks can be stored according to a first-level erasure coding scheme in zones of a geographically diverse data storage system. The chunks can then be further protected via one or more second-level erasure coding schema within a corresponding zone of the geographically diverse data storage system. In response to determining segment of a chunk has become less accessible, recover of the segment can be performed according to the hierarchical erasure coding scheme of relevant chunks at relevant zones of the geographically diverse data storage system.