可以在活动的文件系统上执行快照操作，因为它在创建映像时将自动冻结 I/O 操作。
You can perform the snapshot operation on a live file system, as it will automatically freeze I/O operations while the image is taken.
与传统的 Linux 引导过程类似，这个文件也是在将 initrd 映像解压到 RAM 磁盘中时被调用的。
This file, like the traditional Linux boot process, is invoked when the initrd image is decompressed into the RAM disk.
简单地说，在执行安装时，安装映像必须是任何用户或响应文件可能安装的所有特性的超集。
Quite simply, when performing an installation, the installation image has to be a superset of all the possible features that could be installed by any user or any response file.
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