一种优化的闪存转换层的设计与实现

Design and Implementation of Optimized FTL

NAND Flash具有体积小、重量轻以及功耗低等优点,目前被广泛应用于大容量的固态硬盘。但是,NAND Flash本身的特性决定了使用NAND Flash作为存储介质的存储设备需要闪存转换层对NAND Flash进行管理。闪存转换层主要实现了地址映射、坏块管理、垃圾回收以及磨损均衡等功能。根据地址映射算法的不同,不同的闪存转换层所需的资源也不一样。在固态硬盘设备中,SDRAM资源非常有限,所以需要设计一个适合的闪存转换层使得在有限的资源条件下达到最好的性能。针对该问题,设计了一种优化的闪存转换层,实现了固态硬盘的功能。

NAND Flash has the advantages of small size,light weight and low power consumption,and now widely used in SSD(Solid-State Disk).However,The characteristics of NAND Flash determine that storage devices which use NAND Flash as storage media need FTL(Flash Translation Layer)to manage NAND Flash.FTL mainly implements functions such as address mapping,bad block management,garbage collection and wear balance.Depending on the address mapping algorithm,different FTL algorithms require different resources.In SSD devices,DRAM resources are quite limited,therefore,it is necessary to design a suitable FTL to achieve the best performance under limited resource condition.In response this problem,an optimized FTL is designed to realize the function of a solid-state drive.