HP XP1024 Operating System Configuration Manual page 61

You should already know the port number of the plug-in port on the Fibre
Channel switch where you have connected the disk array. If you need to,
trace the Fibre Channel cable from the disk array to the switch and
determine the port to which the array is connected. In the example figure
above, the disk array is connected to pors 5 of the switch. You will notice
the disk model information in the "Symbolic Name" portion of the Name
Server display, at the right on the line for Port # 5.
The Port ID column of the display has the information needed to form the
FC N-Port part of the I/O path. The Port ID is a 6-character hexadecimal
digit (3 bytes) that decomposes into the three portions (Domain.Area.Port)
of the FC N-Port part of the I/O path. Since PDC boot paths are set as
decimal numbers, these three portions of FC N-Port value have to be
converted from hex to decimal before you can use them to set the primary
boot path.
Example for Port #5, Port ID 011532
In the Name Server display above, the disk array on Port 5 has Port ID =
011532, hexadecimal. To convert this to the FC N-Port format required by
PDC, break apart the 6 digit hex number into its 3 hex bytes, and convert
Booting from the array 61