SYSTEM AND METHOD FOR DRAM-LESS SSD DATA PROTECTION DURING A POWER FAILURE EVENT

摘要

A solid-state drive (SSD) may not include a dynamic random access memory (DRAM) but rather may utilize a host memory buffer of system random access memory (RAM). During a power failure data on dirty cache lines may be lost. A power protection caching policy may be implemented where an SSD controller is capable of accepting a flush cache signal, which may be a signal to a redefined pin of the SSD or a command, from a controller of the information handling system. The controller may utilize a slope detect mechanism and/or a power good detect mechanism to detect a power failure and if a power failure is detected to issue a flush cache signal the SSD controller to cause a flush of all dirty cache lines from the host memory buffer before the power failure results in inoperability of circuitry associated with the dirty cache lines.

主权项

1. A method for implementing a power protection caching policy of an information handling system comprising:
querying a solid-state drive (SSD) of the information handling system, wherein the SSD does not include dynamic random access memory (DRAM) local to the SSD; returning, by the SSD, one or more supported caching modes of the SSD; determining if the SSD supports the power protection caching policy based, at least in part, on the one or more supported caching modes; determining a risk of power failure, wherein the risk of power failure is based, at least in part, on one or more risk parameters; setting one or more attributes of the power protection caching policy based, at least in part on, the determined risk of power failure; determining if an indicator is indicative of a power failure; and applying the power protection caching policy, wherein the power protection caching policy comprises:
issuing a flush cache signal by a controller of the information handling system to the SSD;issuing a command by the SSD to flush one or more dirty cache lines; andflushing the one or more dirty cache lines.