Migration from Legacy to Agile Naming Model in VxVM 5.0 on HP-UX 11i v3

1. Legacy and Agile Naming Models
In versions prior to HP-UX 11i v3, the Device Special Files (DSFs) of mass storage
devices were bound to the path of the device. This representation of mass storage
devices still exists in HP-UX 11i v3, and is referred as the legacy view. HP-UX 11i
v3 introduces a new representation for mass storage devices called the agile
view. In this representation, the DSFs of mass storage devices are bound to the
device World Wide Identifier (WWID) making them persistent (that is, each LUN
is uniquely identified by a single DSF, irrespective of the number of LUNpaths and
independent of any physical path changes). The agile view coexists with the legacy
view and both types of DSFs can be used to access a given mass storage device
independently and simultaneously. For additional information on the next generation
mass storage subsystem in HP-UX 11i v3, see the white paper The Next
Generation Mass Storage Stack at http://www.docs.hp.com
Typical legacy and persistent DSFs for a LUN are shown below:
Legacy DSF: /dev/dsk/c0t0d1 and /dev/rdsk/c0t0d1
Persistent DSF: /dev/disk/disk66 and /dev/rdisk/disk66
Viewing Legacy DSF:
# ioscan -funC disk
Class I H/W Path Driver S/W State H/W Type Description
=======================================================================
disk 1 0/0/0/3/0.5.0 sdisk CLAIMED DEVICE HP 73.4GST373307LC
/dev/dsk/c0t5d0 /dev/rdsk/c0t5d0
disk 0 0/0/0/3/0.6.0 sdisk CLAIMED DEVICE HP 36.4GST336753LC
/dev/dsk/c0t6d0 /dev/rdsk/c0t6d0
disk 2 1/0/0/3/0.6.0 sdisk CLAIMED DEVICE HP 36.4GST336753LC
/dev/dsk/c6t6d0 /dev/rdsk/c6t6d0
disk 3 1/0/0/3/1.2.0 sdisk CLAIMED DEVICE HP DVD-ROM 305
/dev/dsk/c7t2d0 /dev/rdsk/c7t2d0
disk 4 1/0/1/0/0/1/1.6.0 sdisk CLAIMED DEVICE HP 73.4GST373307LC
/dev/dsk/c9t6d0 /dev/rdsk/c9t6d0
Viewing Agile DSF:
To view Agile DSF’s please use “-N” option with ioscan command.
# ioscan -fuNC disk
Class I H/W Path Driver S/W State H/W Type Description
===================================================================
disk 5 64000/0xfa00/0x0 esdisk CLAIMED DEVICE HP 36.4GST336753LC
disk 6 64000/0xfa00/0x1 esdisk CLAIMED DEVICE HP 73.4GST373307LC
disk 7 64000/0xfa00/0x2 esdisk CLAIMED DEVICE HP 36.4GST336753LC