HP Serviceguard Version A.11.19 Release Notes, July 2009

Agile addressing is the default on new 11i v3 installations, but the I/O subsystem still
recognizes pre-11i v3 device files, which as of 11i v3 are referred to as legacy device
files. Device files using the new nomenclature are called persistent device files,
When you upgrade to HP-UX 11i v3, a set of new, persistent device files is created, but
the existing, legacy device files are left intact and by default will continue to be used
by HP-UX and Serviceguard.
This means that you are not required to migrate to agile addressing when you upgrade
to 11i v3, though you should seriously consider its advantages (see the white paper
The Next Generation Mass Storage Stack under Network and Systems Management
-> Storage Area Management at docs.hp.com). Migration involves modifying
system and application configuration files and scripts to use persistent device files and
in some cases new commands and options; the process is described in the white papers
Migrating from HP-UX 11i v2 to HP-UX 11i v3 and LVM Migration from Legacy to Agile
Naming Model HP-UX 11i v3 at docs.hp.com.
If you cold-install HP-UX 11i v3, sets of both legacy and persistent device files are
automatically created. In this case, by default the installation process will configure
system devices such as the boot, root, swap, and dump devices to use persistent device
files. This means that system configuration files such as/etc/fstab and /etc/lvmtab
will contain references to persistent device files, but Serviceguard’s functioning will
not be affected by this.
CAUTION: You cannot migrate to the agile addressing scheme during a rolling upgrade
if you are using cluster lock disks as a tie-breaker, because that involves changing the
cluster configuration. But you can migrate the cluster lock device file names to the new
scheme without bringing the cluster down. For the requirements and a procedure, see
“Updating the Cluster Lock Configuration” in Chapter 7 of Managing Serviceguard.
NOTE: It is possible, though not a best practice, to use legacy DSFs on some nodes
after migrating to agile addressing on others; this allows you to migrate different nodes
at different times, if necessary.
For more information about agile addressing, see following documents at
http://www.docs.hp.com.:
• the Logical Volume Management volume of the HP-UX System Administrator’s Guide
(in the 11i v3 -> System Administration collection)
• the HP-UX 11i v3 Installation and Update Guide (in the 11i v3 -> Installing
and Updating collection)
• the following white papers:
— The Next Generation Mass Storage Stack (under Network and Systems
Management -> Storage Area Management)
— Migrating from HP-UX 11i v2 to HP-UX 11i v3
44 Serviceguard Version A.11.19 Release Notes