HP Serviceguard Version A.11.20 Release Notes, April 2011

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 37).
• 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 37).
• 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 38).
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, if you are running Serviceguard A.11.19 on HP-UX 11i v2, and are planning
to upgrade to Serviceguard A.11.20, which runs only on HP-UX 11i v3, you may decide to
upgrade the nodes to HP–UX 11i v3 over a period of time, and then upgrade the cluster to
Serviceguard A.11.20.
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.
Serviceguard A.11.20 is supported only on HP-UX 11i v3.
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 the
address given under “Documents for This Version” (page 34). See also “Upgrading from an Earlier
Serviceguard Release” (page 43).
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:
• The Serviceguard version bundled with the HP-UX Operating Environment (OE) matches the
version already installed.
CAUTION: You need to pay careful attention to the Serviceguard patch level as well as the
Serviceguard version. If you install Serviceguard at a patch level lower than the one the cluster
was running, any new features introduced in the higher-level patch will cease to be available;
you will need to re-install the higher-level patch on all nodes before you can use its features
again.
• The Serviceguard product bundled with the HP-UX OE is installed along with the HP-UX filesets.
(The Serviceguard binary files differ between HP-UX 11i v2 and 11i v3, even though the
Serviceguard version is the same.)
Compatibility Information and Installation Requirements 37