Physical Path

For the purposes of AP, an I/O device is either a disk or network. An I/O controller is the controller card for an I/O device. An I/O port is a connector on a controller card. (Usually there are two ports per controller card.) A device node is a path in the devices directory that is used to specify a physical device, for example, /dev/dsk/c0t0d1s0.

The term physical path refers to the electrical path from the host to a disk or network.

Figure 1-4 Physical Path

You reference a physical device via a device node, for example, /dev/dsk/c0t1d1s0.