HP-UX 11i v3 Mass Storage Device Naming

Abstract
This paper describes the HP-UX 11i v3 mass storage device naming. It is intended for system
administrators and other users of the HP-UX mass storage subsystem. The reader is assumed to have a
basic knowledge of the mass storage device naming on HP-UX releases prior to HP-UX 11i v3.
HP-UX 11i v3 introduces a new agile naming scheme for mass storage devices, which addresses the
limitations of the device naming scheme used in previous releases of HP-UX 11i. The document
provides an overview of the benefits of the agile naming scheme, and presents the new format of
device special file names and hardware paths.
Terms and Definitions
Agile addressing The Device File Name of the logical unit is independent of the paths
leading to the LUN.
The ability to address a logical unit with the same device file regardless
of the location of the LUN, i.e. The device file for a LUN remains the
same even if the LUN is moved from one HBA to another, from one
switch/hub port to another or presented via a different target port to the
host.
Agile View of the
I/O tree
View of the I/O Tree using agile addressing to represent elements of the
I/O tree.
(Legacy) H/W Path H/W Path in the legacy format. Used for all components, mass storage
or not.
Legacy or agile I/O
Tree
The I/O Tree is the HP-UX representation of physical and virtual devices
discovered by the Operating System. The legacy I/O tree is limited to the
legacy view. The agile I/O tree is limited to the agile view.
LUN Logical unit that refers to an end storage device such as disk, tape,
floppy, cdrom, changer, etc. This is the logical unit itself and does not
represent the path to the logical unit.
lunpath I/O path to a LUN in agile format.
LUN id This is the SCSI address of the LUN within the target as defined in the
SCSI standard.
Agile naming model DSF naming model introduced in HP-UX 11i v3 to support agile
addressing.
Persistent DSF DSF following the persistent naming model conventions. Does not contain
any encoding of bus, target identifier or device specific option
information.
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