A time-sensitive and efficient hybrid storage model involving SSD and HDD

作者：Yang Pu Yuan; Jin Pei Quan^*; Yue Li Hua

来源：Chinese Journal of Computers, 2012, 35(11): 2294-2305.

DOI：10.3724/SP.J.1016.2012.02294

• Flash
• Hybrid storages
• Price ratio
• SSD
• Time-sensitive

Solid state driver (SSD) based on flash memory has become a persistent storage device widely used. But it can not take place the magnetic disks absolutely due to the imbalance I/O character and the high price of flash memory. The hybrid storage system consisted of SSD and HDD is gradually becoming the research issue. For the hybrid storage with SSD and HDD, this paper proposes a time-sensitive hybrid storage model to efficiently take use of SSD. This model takes SSD and HDD at the same level of the memory hierarchy. According to the page access counter and access temperature, the model achieves accurate page classification and placement which places the hot and read-intensive pages SSD and places the cold or write-intensive pages to HDD. So the model takes advantage of the asymmetric I/O properties of HDD and SSD to reduce total I/O latency of system. We separately realizes the model on the hybrid storage based on high-end SSD and middle-end SSD and finish the performance evaluation. The experimental result shows that our model can achieve more accurate page classification, reduce the migration cost and get obvious performance improvement with fewer SSD.

• 出版日期2012
• 单位中国科学技术大学