IEEE Computer Architecture Letters

IEEE Computer Architecture Letters (CAL) is a semi-annual forum for fast publication of new, high-quality ideas in the form of short, critically refereed, technical papers. Submissions are welcomed on any topic in computer architecture.


From the January-June 2015 issue

Refactored Design of I/O Architecture for Flash Storage

By Sungjin Lee, Jihong Kim, and Arvind Mithal

Featured article thumbnail imageFlash storage devices behave quite differently from hard disk drives (HDDs); a page on flash has to be erased before it can be rewritten, and the erasure has to be performed on a block which consists of a large number of contiguous pages. It is also important to distribute writes evenly among flash blocks to avoid premature wearing. To achieve interoperability with existing blockI/O subsystems for HDDs, NAND flash devices employ an intermediate software layer, called the flash translation layer (FTL), which hides these differences. Unfortunately, FTL implementations require powerful processors with a large amount of DRAM in flash controllers and also incur many unnecessary I/O operations which degrade flash storage performance and lifetime. In this paper, we present a refactored design of I/O architecture for flash storage which dramatically increases storage performance and lifetime while decreasing the cost of the flash controller. In comparison with page-level FTL, our preliminary experiments show a reduction of 19 percent in I/O operations, improvement of I/O performance by 9 percent and storage lifetime by 36 percent. In addition, our scheme uses only $\frac{1}{128}$ DRAM memory in the flash controller.

download PDF View the PDF of this article      csdl View this issue in the digital library


Editorials and Announcements

Editorials


Reviewers List


Annual Index


Access recently published CAL articles

RSS Subscribe to the RSS feed of latest CAL content added to the digital library.


Mail Sign up for the Transactions Connection newsletter.


CAL Flyer thumbnail

Download the IEEE Computer Architecture Letters flyer (PDF)

Computing Now
.