HP Serviceguard Version A.11.19 Release Notes, March 2009

NOTE: In all three cases, the discussion refers to mixing HP-UX versions 11i v2 and
11i v3. Unless explicitly stated otherwise, “version” in this subsection means HP-UX
version, not Serviceguard version.
• Homogeneous cluster refers to a cluster that is not being upgraded, and which
has no need to include nodes running different major versions of HP-UX. See “HP
Recommendation for Homogeneous Clusters” (page 47).
• Cluster in transition refers to a cluster whose HP-UX version is being upgraded
as part of a normal rolling upgrade that occurs over a relatively short period. See
“Rules and Restrictions for Clusters in Transition” (page 47).
• Heterogeneous cluster refers to a cluster that contains a mix of nodes running
HP-UX 11i v2 and 11i v3. See “Rules and Restrictions for Heterogeneous Clusters”
(page 48).
Such a cluster is either being upgraded from HP-UX 11i v2 to 11i v3 over an
extended period, or for some other reason needs to accommodate nodes running
both versions of HP-UX (for example you might have purchased a new server,
running HP-UX 11i v3, and want to add it to an existing cluster whose nodes are
running 11i v2).
HP Recommendation for Homogeneous Clusters
All nodes should be running the same major HP-UX version. Major version means a
release such as 11i v2 or 11i v3. It is acceptable to have a mix of different HP-UX Fusion
releases for the same major revision (for example, 11i v2 September 2004 and 11i v2
September 2006), although it is generally best to have all nodes running the same Fusion
release at the same patch level.
Rules and Restrictions for Clusters in Transition
You can upgrade a cluster from HP-UX 11i v2 to 11i v3 as part of a rolling upgrade. A
rolling upgrade includes upgrading to a new version of Serviceguard. Rules, guidelines,
and restrictions for rolling upgrades are in Appendix D of Managing Serviceguard, which
you can find at http://www.docs.hp.com -> High Availability ->
Serviceguard. See also “Upgrading from an Earlier Serviceguard Release” (page 55).
It is also possible to upgrade the HP-UX version without upgrading Serviceguard, and
so avoid the rolling upgrade restrictions. In this case you must make sure that:
Compatibility Information and Installation Requirements 47