HP-UX 11i v3 Native Multi-Pathing for Mass Storage (September 2009)

H/W Path in the legacy format (pre HP-UX 11i v3). Used for all components, including mass
storage.
Legacy Naming Model / Legacy Format
DSF format convention used prior to HP-UX 11i v3. This model is maintained in HP-UX 11i v3 for
backward compatibility purpose.
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 pre-11i v3 I/O tree view is present on HP-UX 11i v3 for backward
compatibility reasons. The legacy I/O tree is limited to the pre-11i v3 I/O tree 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, and
so forth. This is the logical unit itself and does not represent the path to the logical unit.
LUN Hardware Path
Hardware path to the LUN in the agile view of the I/O Tree. It has the form 64000/0xfa00/0x*
LUN id
Equivalent to the logical unit number defined by the T10 SAM standard.
Lunpath
Path to a LUN. It is also known as an I_T_L nexus.
Lunpath Hardware Path
The hardware path of a Lunpath. In the agile view of the I/O tree, the lunpath hardware path
format is:
hba_path.Target_port_WWN or Target_Id.0xLUN_id
Path
An I_T or I_T_L nexus as defined in the T10 SAM standard.
Persistent DSF
DSF following the agile naming model conventions. Does not contain any encoding of bus, target
identifier or device specific option information.
SAM
T10 SCSI Architecture Model standard (available at
http://www.t10.org).
SCSI Class Driver
An HP-UX device driver that manages one or more specific classes of mass storage devices. For
example: Disk Driver, Tape Driver, Changer Driver, and Pass-Through Driver.
SCSI Interface Driver
An HP-UX device driver that manages one or more specific types of Host Bus Adapters. For
example: Tachlite FC Driver and Qlogic FC Driver.
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