Migration of encrypted data for data storage systems

摘要

Systems and methods for compression, formatting, and migration of data for data storage systems are disclosed. In some embodiments, data repacking can be used in any situation where embedded metadata needs to be accessed, such as during data migration, and where the underlying data is encrypted. In some embodiments, performance is increased because encrypted data is repacked without first performing decryption. In addition, data may also be compressed and repacking can be performed without performing decompression. Advantageously, there is no need to retrieve or wait for the availability of encryption key (or keys) or expand resources in decrypting (and decompressing) data before repacking it and encrypting repacked data. Available capacity for storing user data, reliability, and performance of the data storage system can be increased.

主权项

1. A data storage system comprising:
non-volatile memory (NVM) configured to store data in a plurality of memory data units, a memory data unit corresponding to a unit of storage in the NVM, wherein at least some memory data units have a different format; and a controller configured to:
retrieve from the NVM data stored in a first memory data unit, the first memory data unit further storing metadata associated with the data, wherein the data is encrypted and the metadata is not encrypted, andusing the metadata and without decrypting the data, migrate the data from the first memory data unit to a second memory data unit, the format of the second memory data unit being different than the format of the first memory data unit,wherein migrating the data from the first memory data unit to the second memory data unit causes at least some data stored in the first memory data unit to become invalid, andwherein migrating the data from the first memory data unit to the second memory data unit causes improved performance or reliability of the data storage system, wherein the NVM comprises a non-volatile solid-state memory array and a magnetic storage, wherein a physical storage unit of the non-volatile solid-state memory array is larger in size than a physical storage unit of the magnetic storage, and wherein the controller is further configured to format the data to be stored in a physical storage unit of a different size in performing the migration.