后者必不可少，因为服务器默认将从指定文档根下的文件系统中提供所请求的文件。
The latter is required because by default the server will provide the file requested from the filesystem within the specified document root.
但是，可能需要查看发行版的文档，确保系统支持LVM2根文件系统。
But you may want to browse through your distro documentation and make sure that LVM2 root filesystems are supported.
根文件系统包含工具包所用的全部安装、诊断和恢复工具，包括 Linux on POWER 文档编目。
The root filesystem contains all installation, diagnostics, and recovery tools used by the toolkit, including the Linux on POWER documentation catalog.
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