目前正在研究快照的实现方案，对于检查点和快照的关系比较困惑，主要是检查点的实现与快照类似，不知道有什么异同，所以添加博文一篇，作为分析总结只用。
1. 检查点 checkpoint
SNIA对checkpoint有两种不同的定义：
1） [Data Recovery] The recorded state of an application at an instant of time, including data, in-memory variables, program counter, and all other context that would be required to resume application execution from the recorded state.【数据恢复】记录应用的即时状态，包括数据、内存变量、程序计数器和其他所有的用于恢复应用可执行环境的上下文。
2） [File System] An activity of a , such as the High Performance File System, (HPFS) or the Andrew File System (AFS), in which cached (data about the structures of the file system) is periodically written to the file system's permanent store, allowing the file system to maintain consistency if an unexpected stop occurs.【文件系统】
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