这个网格文件系统不仅需要存储区块，还要存储元数据信息，像目录、文件名、文件大小、最后修改时间等。
The grid file system needs to not only store chunks, but also metadata information, such as directories, files, file sizes, last modification times and so on.
这些工具将收集大量信息，以帮助确定系统是否具有良好的性能设计，其中包括关于请求响应时间、处理器使用率等的数据。
These tools collect much information to help you determine whether your system is in good performance shape, including data on request response times, processor utilization, and more.
基于进入系统的时间，写操作具有幂等性(不管操作多少次结果都不变的性质，比如取绝对值的函数就具有幂等性)和交换性(操作顺序不影响结果，比如加法就具有交换性)。
Write operations are idempotent and commutative, based on the time they enter the system.
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