HP-UX 11i v3 Mass Storage Device Naming

Notes:
• The lunpath represents an I/O path to a LUN. In the agile view of the I/O tree, it is an
independent SCSI object of the class ‘lunpath’, and bound to the pseudo-driver eslpt.
• Likewise the target path is an independent object in the agile view of the I/O tree. It is of
class ‘tgtpath’ and is bound to the pseudo-driver estp.
The following output of the ioscan command shows examples of lunpath hardware paths. The first
three correspond to lunpaths of devices attached to system via parallel SCSI, and they include the port
identifier. The last three correspond to lunpaths of devices attached to system via Fibre Channel. They
include the target port WWN.
# ioscan -kfNClunpath
Class I H/W Path Driver S/W State H/W Type Description
==================================================================
lunpath 2 0/0/2/0.0.0x0.0x0 eslpt CLAIMED LUN_PATH LUN path for
disk17
lunpath 1 0/1/1/0.0x0.0x0 eslpt CLAIMED LUN_PATH LUN path for
disk16
lunpath 0 0/1/1/0.0x1.0x0 eslpt CLAIMED LUN_PATH LUN path for
disk15
lunpath 7 0/3/1/0.0x21000020370fe8c8.0x0 eslpt CLAIMED LUN_PATH LUN path for
disk22
lunpath 4 0/3/1/0.0x21000020371972e3.0x0 eslpt CLAIMED LUN_PATH LUN path for
disk19
lunpath 5 0/3/1/0.0x21000020371972eb.0x0 eslpt CLAIMED LUN_PATH LUN path for
disk20
Notes:
• The elements of the lunpath hardware path, up to the HBA hardware path, are in decimal,
but the target port WWN or port id and the SCSI-3 LUN id are displayed in hexadecimal for
ease of reading and correlation with the hardware components.
• For parallel SCSI, the elements of the legacy hardware path and of the lunpath hardware
path are the same, with the only difference that the port id and SCSI-3 LUN id are displayed
respectively in decimal and in hexadecimal.
• For Fibre Channel, the LUN id can be decoded in a LUN number and addressing method
using the command ‘scsimgr get_attr –a lunid –H <lunpath_hw path> ‘
Mapping Between Agile Addressing Scheme and Legacy
Scheme
In HP-UX 11i v3 the ioscan command has new options –N and –m. The –N option displays the agile
addressing view of the I/O tree. The –m option displays mappings between elements of the agile
view and elements of the legacy view.
Mapping between legacy DSFs and persistent DSFs
• To view the legacy DSFs corresponding to a persistent DSF.
o ioscan -m dsf <persistent_dsf>
In the example below disk19 has 2 I/O paths. The persistent DSF /dev/disk/disk19
represents the disk independently of its paths. The 2 legacy DSFs /dev/dsk/c4t1d0 and
/dev/dsk/c5t1d0 are associated to each path.
10/13