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Understanding Device Special File Names

1-6 Peripherals Configuration (R1001H) HP-UX version 11.00.01

Understanding Device Special File Names

Device special files tell the HP-UX operating system which device driver to use,

how to find the peripheral device, and what characteristics the peripheral device

should employ. Characteristics vary by device. For example, device special files for

tape drives show rewind and density.

Most device special file names contain the location of the device on the bus

architecture. To see this, display the files in any subdirectory of the /dev directory.

Note, all mass storage devices adhere to a syntax that includes c#t#d#[s#]

(other kinds of device files use a related convention).

The c#t#d#[s#] syntax used in default device special files has the following

meaning:

Sample Device Special File Names

Every peripheral-specific chapter in this book lists the default device special file

names for that class of device. See the “Administering Fault Tolerant Hardware”

chapter in the HP-UX Operating System: Fault Tolerant System

Administration (R1004H) for information about determining peripheral hardware

addresses.

c# card instance for the ext_bus class of interface card to which the

device is attached

t# target (SCSI address) of the disk device on the interface

d# device unit number

s# section number (provided for backward compatibility); the device file

addresses the entire disk (s0) when s# is unspecified

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