对应用程序透明：应用程序会将RAID作为一个整体，我的文本编辑器才不会关心它加载或者保存的文件是要读写多个磁盘的。
Transparent to the application: applications using the RAID as a single device. My text editor doesn't care that the file it is saving or loading is split across many disks.
很多桌面应用程序允许用户随时保存文件，还有一些产品会自动保存正在编辑的文件以最小化因程序崩溃而造成的数据损失。
Many desktop applications let users save documents at any time, and many products automatically save documents being edited to minimize data loss if the application crashes.
因此对于样例应用程序，您只需编辑persistence . xml文件，取消对这些属性的注释并保存文件。
So for the sample application you can simply edit the persistence.xml file, uncomment those properties, and save the file.
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