YU Xiao, TAN Yu'an, ZHANG Changyou, LIANG Chen, Khaled AOURRA, ZHENG Jun, ZHANG Quanxin. A High-Performance Hierarchical Snapshot Scheme for Hybrid Storage Systems[J]. Chinese Journal of Electronics, 2018, 27(1): 76-85. doi: 10.1049/cje.2017.10.008
Citation: YU Xiao, TAN Yu'an, ZHANG Changyou, LIANG Chen, Khaled AOURRA, ZHENG Jun, ZHANG Quanxin. A High-Performance Hierarchical Snapshot Scheme for Hybrid Storage Systems[J]. Chinese Journal of Electronics, 2018, 27(1): 76-85. doi: 10.1049/cje.2017.10.008

A High-Performance Hierarchical Snapshot Scheme for Hybrid Storage Systems

doi: 10.1049/cje.2017.10.008
Funds:  This work is supported by the National Natural Science Foundation of China (No.U1636213, No.61672508, No.61379048), Beijing Municipal Natural Science Foundation (No.4172053), and Natural Science Foundation of Henan (No.162300410322).
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  • Corresponding author: ZHANG Quanxin (corresponding author) Ph.D., master supervisor in Beijing Institute of Technology, China. His main research interests focus on storage algorithm and mobile computing. (Email:zhangqx@bit.edu.cn)
  • Received Date: 2017-03-13
  • Rev Recd Date: 2017-05-19
  • Publish Date: 2018-01-10
  • With the increased snapshot operations (creation or deletion), the performance of storage system will degrade severely whether in Copy on write (COW) or Redirect on write (ROW). This paper presents a novel snapshot scheme which could use of storage resources effectively and keep the historical data accurately for SSDHDD-hybrid storage system. SSD (source volume) stores all the active data and executes read/write operations without responding to snapshot operations. In contrast, HDDs (snapshot volume) store the writing data sequentially in the form of logs and are responsible for backup and snapshot operations. In this way, the hybrid storage system can get the high throughput power via SSD even the snapshot functions are active and HDDs can keep pace with the high Input/Output operations per second (IOPS) capability of the SSD. Logs are combined and kept in a separate image volume by the controller. So, fine-grained Recovery point objective (RPO) and good Recovery time objective (RTO) can be achieved. Experiment results show that the prototype can achieve excellent I/O performance while snapshot operations are active and consume a few extra storage space.
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