Issue No.12 - December (2009 vol.58)
Qing Yang , University of Rhode Island, Kingston
Jin Ren , Huazhong University of Science and Technology, Wuhan
Changsheng Xie , Huazhong University of Science and Technology, Wuhan
Huaiyang Li , Huazhong University of Science and Technology, Wuhan
DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/TC.2009.107
This paper presents a comprehensive study on implementations and performance evaluations of two snapshot techniques: copy-on-write snapshot and redirect-on-write snapshot. We develop a simple Markov process model to analyze data block behavior and its impact on application performance, while the snapshot operation is underway at the block-level storage. We have implemented the two snapshots techniques on both Windows and Linux operating systems. Based on our analytical model and our implementation, we carry out quantitative performance evaluations and comparisons of the two snapshot techniques using IoMeter, PostMark, TPC-C, and TPC-W benchmarks. Our measurements reveal many interesting observations regarding the performance characteristics of the two snapshot techniques. Depending on the applications and different I/O workloads, the two snapshot techniques perform quite differently. In general, copy-on-write performs well on read-intensive applications, while redirect-on-write performs well on writeintensive applications.
Data storage, data protection, snapshot, copy-on-write, redirect-on-write.
Qing Yang, Jin Ren, Changsheng Xie, Huaiyang Li, "Design and Analysis of Block-Level Snapshots for Data Protection and Recovery", IEEE Transactions on Computers, vol.58, no. 12, pp. 1615-1625, December 2009, doi:10.1109/TC.2009.107