基于虚拟存储层的缓存控制软件设计

The Design of Cache Control Software Based on Virtual Storage Layer

摘要:

缓存加速技术可以利用固态硬盘(solid state disk,SSD)随机访问性能高的优势,提升机械硬盘的随机读写性能。传统的缓存加速技术难以适应大数据背景下高并发、间歇性频繁访问等热点数据访问需求。为了提升缓存整体性能,提出一种基于虚拟存储层的缓存策略(The cache policy based on the virtual storage layer,CVSL),将缓存技术和分层存储技术相结合,通过热度统计、数据逻辑迁移,实现基于数据逻辑分层的缓存控制。实验结果表明,相对传统的缓存策略,CVSL策略的随机读写性能提升了9-10%,未见明显波动,在缓存命中率方面具有良好的效果,达到了预期设计目标。

Abstract:

Cache acceleration technology can take advantage of the high performance of random access of solid state drives (solid state disks,SSD) to improve the random read and write performance of mechanical hard drives. Traditional cache acceleration technology is difficult to adapt to the needs of hot data access such as high concurgency and intermittent frequent access under the background of big data. In order to improve the overall performance of the cache, a cache strategy based on the virtual storage layer (The cache strategy based on the virtual storage layer, CVSL) is proposed, which combines the caching technology with the hierarchical storage technology to realize the cache control based on the data logic layering through thermal statistics and data logical migration. Experimental results show that compared with the traditional caching strategy, the random reading and writing performance of CVSL strategy has improved by 9-10%, no obvious fluctuations have been seen, and the cache hit rate has a good effect, and the expected design target has been achieved.