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A Method for Enhancing the Snapshot Performance in SAN Volume Manager
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- Issue Date
- 2004-02
- Citation
- International Conference on Advanced Communication Technology (ICACT) 2004, pp.945-948
- Publisher
- IEEE
- Language
- English
- Type
- Conference Paper
- Abstract
- Linux-based storage clustering software, SANtopia Volume Manager (SVM), has provided various online volume management features to support enterprise computing in a SAN environment in which a number of storages and host computers are connected with each other through fiber channel. The online snapshot is one of the representative features provided by SVM and enables online backup of data without system downtime. In this paper, we propose an advanced online snapshot technique to enhance overall system performance. The SVM has taken relatively long time depending on the size of the logical volume when performing a snapshot creation or deletion operation. Additionally, it consumed more time to perform a normal I/O operation on the original data with a snapshot than without a snapshot. In order to solve the problems described above, we update the metadata structure of SVM and enhance performance by reducing the execution time of snapshot creation, snapshot deletion, and normal I/O operation with a snapshot. Also, we can provide system confidence by ensuring that all I/O operations have the same performance regardless of the existence of a snapshot.