The Design Of Cache Based On SMR Disk

This paper proposes a replacement algorithm of buffer based on SMR disk, with the aim to make the storage system of SMR disk to a get better use. The algorithm mainly by considering head position and writing amplification problem of SMR disk to replace the buffer data blocks, this approach will be different from the traditional replacement algorithms based on conventional Winchester hard disk. Traditional replacement algorithms generally care about to improve the hit rate, while ignoring more hardware features of storage device,they made the storage device as a black box to use,this approach will make the phenomenon of improving the hit rate of buffer but reducing the response time of the system.Furthermore,writing amplification problem will increase the time cost.We design the algorithm with considerations of these three parameters of a head position, write amplification and data access frequency, and compare with LRU algorithm.The results of experiments show that the SMR hard driven system, with the increasing host access requests,will waste more and more time by LRU algorithm,but the new proposed algorithm will reduce the waste, improve the response speed of the system.