Abstract: Snapshot technique has wide application in backup, data mining and related fields. Also there are many approaches to create snapshot. Compound snapshot algorithm is a new snapshot technique. It can create unlimited snapshot chain and supply reasonable I/O performance. This article introduces idea of compound snapshot algorithm followed by two varieties. Based on the test result, analysis and comparison are also given.

Key words: Snapshot algorithm, Compound, Volume management

摘要： 快照技术在备份、数据挖掘等领域有着广泛的应用，而创建快照的方法也有很多种。复合式快照算法是一种新型的快照生成技术，该算法可以创建不限长度的快照链，并且每个卷可以提供合理的读写性能。该文分析了该算法的流程，并提出了该算法的两种变型。在性能测试与空间利用率测试的基础上，对该两种变型进行了分析与比较。

关键词: 快照算法, 复合式, 卷管理

CLC Number: 

• TP311