Which path links storage devices based on the physical port connection?

The path that links storage devices based on the physical port connection is located in /dev/disk/by-path. This directory contains symbolic links that point to the actual device files in /dev, and each link is named according to the physical connection of the storage device. The naming convention reflects the port and bus location of the device, giving a clear mapping from the device to its physical connection on the system. This is particularly useful for managing devices in scenarios where multiple devices may be connected through different interfaces or ports.

For instance, if you have multiple devices connected via USB to different ports, the links in /dev/disk/by-path will indicate which physical port each device is connected to, making it easier to identify or troubleshoot these devices based on their connection locations.

Other options provided, such as /dev/disk/by-id, primarily refer to identifying devices by unique identifiers (like serial numbers), while /proc/mounts and /proc/partitions are more concerned with filesystem mounts and partition information respectively, rather than the physical connection specifics of storage devices.