Research On Object-based Storage Acceleration With Solid State Disk

With the development of hardware technology of computer architecture and the increasing requirements of mass data storage, new storage devices and advanced storage architectures are needed to bring high-performance mass storage.Solid State Disk won its edge over hard disk in storage systems, for it provides better I/O performance. At the mean time, Object-based storage architecture beat the other storage architectures. In this paper, we investigate SSD and Object-based storage, and propose an Object-based storage acceleration system with SSD.What we have done are as follows.(1) We study solid state disk techniques, architectures and accessing features. Then we analysis the different I/O characteristics of hard disk, Flash-based solid state disk and DRAM-based solid state disk respectively.(2) We study the development of storage architectures and focus on Object-based storage architecture and Object-based storage file systems.(3) Based on Lustre file system and the characteristic of solid state disk, we propose an Object-based storage acceleration system with SSD.(4) We analysis the I/O access patterns and multi-experts system, as well as classic algorithms of cache replacement and prefetching. Then we design the algorithm of multi-experts object management.(5) We implement the prototype for the algorithm of object cache management, along with replacement expert modules as FIFO,LRU,LFU and MRU. The result of test under different I/O access patterns demonstrates the adaptivity of our algorithm.(6) We implement the prototype for the model of hybrid OST and make a comparison of latencies under random I/O access pattern respectively.Some of the key techniques and design ideas of our work are also helpful for the research of other storage systems.