When you export the volume group, you effectively package all its logical volumes and file systems along with the directories and files in them.
在导出卷组的时候，可以将所有逻辑卷和文件系统与其中的目录和文件一起有效打包。
This saves you rebuilding the logical volumes and file systems yourself, as you would need to do before running a traditional restore or copy operation.
这样您就不必自己重新构建逻辑卷和文件系统，否则需要像以前一样进行传统的恢复或复制操作。
JFS and JFS2 file systems require a logical volume for the JFS log.
JFS和JFS2文件系统需要一个用于JFS日志的逻辑卷。
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