Systems and methods for contextual storage

摘要

A storage layer presents logical address space of a non-volatile storage device. The storage layer maintains logical interfaces to the non-volatile storage device, which may include arbitrary, any-to-any mappings between logical identifiers and storage resources. Data may be stored on the non-volatile storage device in a contextual format, which includes persistent metadata that defines the logical interface of the data. The storage layer may modify the logical interface of data that is stored in the contextual format. The modified logical interface may be inconsistent with the existing contextual format of the data on the non-volatile storage media. The storage layer may provide access to the data in the inconsistent contextual format through the modified logical interface. The contextual format of the data may be updated to be consistent with the modified logical interface in a write out-of-place storage operation.

主权项

1. A method, comprising:
performing a logical copy operation pertaining to a plurality of data segments stored on a non-volatile storage device to reference the stored data segments through a first set of logical addresses of a logical address space and a second, different set of logical addresses of the same logical address space; servicing a request to revise data of a stored data segment, wherein the stored data segment is referenced by a first logical address in the first set of logical addresses and a second logical address in the second set of logical addresses, and wherein servicing the request comprises writing at least the revised data to a different data segment on the non-volatile storage device; and referencing the stored data segment through the first logical address and referencing the different data segment through the second logical address after servicing the request.