ISBN: 978-0-9853483-3-5 ©2013 SDIWC DESIGN AND IMPLEMENTATION OF CACHE MANAGER FOR HYBRID STORAGE

The technology and cost barrier of the SSD motivated many research groups and companies to merge the SSD with low cost and large capacity storage device, Hard Disk Drive (HDD). As the NAND flash memory technology is getting more advanced, price of NAND flash memory dropped dramatically. As number of bits per cell in NAND flash memory is increasing, the price of $/GByte is reduced. This trend will continue until the market sought for another media as a stable and fast storage media. NAND flash based Solid State Drive (SSD) is considered as a choice for replacing Hard Disk Drive (HDD) to reduce and minimize the gap between IO latency DRAM of a storage device. In this work, we first examine three existing cache manager solutions and study if advertised measurements hold in in-house benchmark environment. We describe what has to be considered in implementing cache managers, and also describe design and implementation of a cache manager and measure its caching performance