A Study of Restoration Method Considering TCP Characteristics during Slow-Start
Hitoshi Kamei, Takaki Nakamura, Hiroaki MURAOKA · IEEJ Transactions on Electronics Information and Systems · 2022
A data restoration method for the large-scale disasters is proposed. Recently, social data, e.g. resident information or medical information, are stored into information systems. The social data are backed up to remote site to protect from data loss. It is important for restoration to be able to utilize the backup data as soon as possible. Thus, a part of backup data, e.g. files, is individually restored (File-lvl Restore). To reduce the time to get backup data by the File-lvl Restore more further, we apply the parallel data downloading. However, the current method does not consider the TCP slow-start processing; thus, the number of chunks of parallel downloading becomes insufficient. In this paper, we propose a data restoration method that decides the number of chunks based on Round Trip Time and the characteristics of TCP slow-start. Our evaluation results show that the time to get the backup data by using the proposed method becomes 1/2 to 1/3 compared to the current method.