Abstract: With the wide application of snapshot technology, there are many different approaches of realization. Compared to the snapshot on file systems, this snapshot can not only work on different file systems, but also has a good performance. And by using a simple hash algorithm, the metadata searching accelerates. Test results show that this snapshot performs steadily and efficiently, and in most cases, the method of Redirect-on-Write(RoW) is better than Copy-on-Write(CoW).

Key words: snapshot, data backup, Copy-on-Write(CoW), Redirect-on-Write(RoW)

摘要： 设计并实现一种基于块设备的多版本快照技术，采用简单的哈希算法加快查询元数据节点速度，可在不同文件系统中工作。测试结果表明，与文件系统层的快照技术相比，该快照技术具有稳定的较高的性能，且在多数情况下写重定向性能优于写前拷贝。

关键词: 快照, 数据备份, 写前拷贝, 写重定向

CLC Number: 

• TP311.12