Veritas Volume Manager 5.0.1 Administrator's Guide, HP-UX 11i v3, First Edition, November 2009

Displaying the disk-naming scheme
VxVM disk naming can be operating-system based naming or enclosure-based
naming. This command displays whether the VxVM disk naming scheme is
currently set. It also displays the attributes for the disk naming scheme, such as
whether persistence is enabled.
To display the current disk-naming scheme and its mode of operations, use the
following command:
# vxddladm get namingscheme
See “Disk device naming in VxVM” on page 77.
Regenerating persistent device names
The persistent device naming feature makes the names of disk devices persistent
across system reboots. DDL assigns device names according to the persistent
device name database.
If operating system-based naming is selected, each disk name is usually set to the
name of one of the paths to the disk. After hardware reconfiguration and a
subsequent reboot, the operating system may generate different names for the
paths to the disks. Therefore, the persistent device names may no longer
correspond to the actual paths. This does not prevent the disks from being used,
but the association between the disk name and one of its paths is lost.
Similarly, if enclosure-based naming is selected, the device name depends on the
name of the enclosure and an index number. If a hardware configuration changes
the order of the LUNs exposed by the array, the persistent device name may not
reflect the current index.
To regenerate persistent device names
◆
To regenerate the persistent names repository, use the following command:
# vxddladm [-c] assign names
The -c option clears all user-specified names and replaces them with
autogenerated names.
If the -c option is not specified, existing user-specified names are maintained,
but OS-based and enclosure-based names are regenerated.
The disk names now correspond to the new path names.
Administering disks
Changing the disk-naming scheme
102