[Colloq] Talk Announcement: Tuesday August 28th at 2:00pm in 366 WVH by Sam H. Noh, Hong-Ik University, Seoul Korea

[Nicole Bekerian]

The College of Computer and Information Science presents:

Speaker: Sam H. Noh, Hong-Ik University, Seoul Korea
Title: Caching less for better performance: Balancing cache size and update cost of flash memory cache in hybrid storage systems
Location: 366 WVH
Date & Time: Tuesday August 28th, 2:00 PM

Host: Peter Desnoyers

Abstract:
Hybrid storage solutions use NAND flash memory based Solid State Drives (SSDs) as non-volatile cache and traditional Hard Disk Drives (HDDs) as lower level storage.  Unlike a typical cache, internally, the flash memory cache is divided into cache space and over-provisioned space, used for garbage collection. 

We show that balancing the two spaces appropriately helps improve the performance of hybrid storage systems. We show that contrary to expectations, the cache need not be filled with data to the fullest, but may be better served by reserving space for garbage collection. For this balancing act, we present a dynamic scheme that further divides the cache space into read and write caches and manages the three spaces according to the workload characteristics for optimal performance. 

Experimental results show that our dynamic scheme improves performance of hybrid storage solutions up to the off-line optimal performance of a fixed partitioning scheme. Furthermore, as our scheme makes efficient use of the flash memory cache, it reduces the number of erase operations thereby extending the lifetime of SSDs.

Bio:

Sam H.(Hyuk) Noh received the BS degree in computer engineering from the Seoul National University, Korea in 1986, and the PhD degree from the Department of Computer Science, University of Maryland at College Park in 1993. He is a professor in the School of Information and Computer Engineering at Hong-Ik University in Seoul Korea, and has held visiting positions at George Washington University and University of Maryland.

His current research interests are in operating system issues pertaining to embedded/computer systems.



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Best, 
Nicole 

______________________________________________________________ 

Nicole Bekerian 
Administrative Assistant 

Northeastern University 
College of Computer and Information Science 
360 Huntington Ave. 
202 West Village H 
Boston, MA 02115 

Phone: 617.373.2462 
Fax: 617.373.5121