HP-UX System Administrator's Guide: Overview

Instead of a series of bus-nexus addresses (corresponding to specific hardware paths)
leading to the HBA, virtual hardware paths use a virtual bus-nexus (known as the
virtual root node) with an address of 64000. Addressing beneath that virtual root node
consists of a virtual bus address and a virtual LUN ID, delimited by slash characters
(“/”).
64000/0xfa00/0x22 is an example of a virtual hardware address.
Figure 3-5 LUN Hardware Path Components
64000/0xfa00/0x22
Virtual
Root
Node
Virtual
Bus
Address
Virtual
LUN ID
Example 3-2 Hardware Path Format Summary
The three formats described previous are different ways of referring to the same LUN,
so a single LUN could have all of the following addresses:
0/2/1/0.1.4.0.0.2.7
0/2/1/0.1.5.0.0.2.7
0/4/1/0.1.4.0.0.2.7
0/4/1/0.1.5.0.0.2.7
0/2/1/0.0x50001fe1500170ac.0x4017000000000000
0/2/1/0.0x50001fe1500170ad.0x4017000000000000
0/4/1/0.0x50001fe1500170ac.0x4017000000000000
0/4/1/0.0x50001fe1500170ad.0x4017000000000000
64000/0xfa00/0x22
In the previous example the LUN has four physical hardware paths. The first four lines
represent them using the legacy hardware path format, the next four lines represent
them using the SCSI-3 hardware path format, and the final line represents the single
virtual hardware path (used for all four physical paths).
HP-UX 11i version 3 commands will accept any of these three formats to specify a
hardware path to a LUN.
Commands Associated with Device Special Files
Here is a list of key commands used for managing device special files:
insf
Used during boot to create both legacy and persistent device
special files for new devices. insf can also be used manually,
while the system is running, to create such device special files
(for example, if ioscan caused new hardware to be discovered
Storage on HP-UX 67