DYNAMIC ADJUSTMENT OF DATA PROTECTION SCHEMES IN FLASH STORAGE SYSTEMS BASED ON TEMPERATURE, POWER OFF DURATION AND FLASH AGE

摘要

A data retention methodology for use in electrically rewritable nonvolatile storage systems is disclosed. The methodology collects characteristic data of the storage system (e.g., time stamps, program/erase cycles, sensed temperature over time, and others) and uses at least a portion of that data to associate various data retention schemes with the collected characteristic data. At power-on, the methodology determines a duration of a time during which power was not supplied to the storage system. The methodology also uses the power-on time to trigger the selection of an appropriate data protection scheme (e.g., enhanced ECC and/or read/scrub frequency). Dynamic selection and adjustment of the applied protection scheme may be based on the predetermined and/or calculated association between various protection schemes and the collected characteristic data of the storage system.

主权项

1. A computer implemented method of selecting data protection for a storage device, the method comprising:
storing data in the storage device; determining a data protection scheme based at least in part on characterization data that is specific to the storage device; wherein the characterization data that is specific to the storage device comprises actual performance data of the storage device developed by testing representative samples of the storage device as part of a design process of a storage system in which the storage device is operated; and applying the data protection scheme to the data.