挂载点可用性要求#

This document describes the requirements placed by systemd on the time when various parts of the file system hierarchy must be available and mounted during boot. This document should be read in conjunction with UAPI.9 Linux File System Hierarchy, which describes the role of the mount points discussed here.

If the file system backing a mount point is located on external or remote media that require special drivers, infrastructure or networking to be set up, then this implies that this functionality must be started and running at the point in the boot sequence when that mount point is required.