Serviceguard Extension for RAC Version A.11.17 Release Notes, February 2007

Serviceguard Extension for RAC Version A.11.17 Release Notes
What’s in this Version
Chapter 1 11
HP-UX 11i v3 Operating System Application Release
The A.11.17.01 version of Serviceguard Extension for RAC is a release
that supports the use of the HP-UX 11i v3 Operating System and
provides the following new functionality, features and restrictions:
SGeRAC supports HP-UX agile addressing, sometimes also called
persistent LUN binding, for device special files (DSFs)
See “About Device Special Files”
Veritas CVM and CFS Not Yet Supported
Multipathing, Veritas DMP and Related Features
About Device Special Files
HP-UX releases up to and including 11i v2 use a naming convention for
device files that encodes their hardware path. For example, a device file
named /dev/dsk/c3t15d0 would indicate SCSI controller instance 3,
SCSI target 15, and SCSI LUN 0. HP-UX 11i v3 introduces a new
nomenclature for device files, known as agile addressing (sometimes also
called persistent LUN binding).
Under the agile addressing convention, the hardware path name is no
longer encoded in a storage device’s name; instead, each device file name
reflects a unique instance number, for example /dev/[r]disk/disk3,
that does not need to change when the hardware path does. Agile
addressing is the default on new 11i v3 installations, but the I/O
subsystem still recognizes the pre-11.i v3 nomenclature.
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. It is possible, though not a best practice, to have legacy
DSFs on some nodes and agile addressing on others; this allows you to
migrate the names on different nodes at different times, if necessary.
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 under certain
conditions, you can migrate the cluster lock device file names to the new