Green NAND Device (GND) Driver with DRAM Data Persistence For Enhanced Flash Endurance and Performance

摘要

A Green NAND Device (GND) driver application queries AC line and battery status and then stores an image of processor states and caches and a resume routine to DRAM when power failure occurs. A DRAM image is then stored to flash memory for a persistent mode when battery power is available. The image in DRAM may be a partial image that includes entries, flushed caches, processor contexts, ramdisks, write caches, and a resume context. Endurance of flash memory is increased by a Super Enhanced Endurance Device (SEED) SSD. In a power down mode, the GND driver limits DRAM use and only caches in DRAM data that can be deleted on power down. Host accesses to flash are intercepted by the GND driver and categorized by data type. Paging files and temporary files cached in DRAM are optionally written to flash.

主权项

1. A Green NAND Device (GND) driver with a power down mode comprising:
a grouping engine for grouping data stored into meta-pages; a processes activated when a power down mode routine is activated; the process suspending all applications, services and devices; wherein all data in a host volatile memory is lost when power is lost; a restore image loader that reads a boot image from a flash memory to the host volatile memory when a power down mode routine was previously activated at a prior power down, and executes the boot image from the host volatile memory to store a host processor image.