System Administration Guide: Devices and File Systems

Direct and Bus-Oriented Controllers

You might access disk partitions or slices differently depending upon whether the disk device is connected to a direct or bus-oriented controller. Generally, direct controllers do not include a target identifier in the logical device name.

The conventions for both types of controllers are explained in the following subsections.

Note –

Controller numbers are assigned automatically during system initialization. The numbers are strictly logical and imply no direct mapping to physical controllers.