HP Serviceguard Version A.11.19 Release Notes, March 2009

Release Notes Revisions
Occasionally, important new information warrants revising the Release Notes after
they have gone to press. In such cases HP updates the Release Notes on docs.hp.com
(http://www.docs.hp.com -> High Availability -> Serviceguard ->
Release Notes). Versions with the same part number are differentiated by the
publication date.
Compatibility Information and Installation Requirements
Read this entire document (and any other Release Notes or READMEs for related
products you may have) before you begin an installation.
Compatibility
For complete compatibility information see the Serviceguard/SGeRAC/SMS/Serviceguard
Manager Plug-in Compatibility and Feature Matrix posted at http://www.docs.hp.com
-> High Availability -> Serviceguard -> Support Matrixes.
Mixed Clusters
“Mixed cluster” has several meanings in the context of Serviceguard. The following
are support statements for various types of mixed cluster.
Mixed Serviceguard Versions
You cannot mix Serviceguard versions in the same cluster; all nodes must be running
the same version of Serviceguard.
The sole exception to this rule is a rolling upgrade, during which Serviceguard versions
can be mixed temporarily, but no cluster configuration changes are allowed. See
“Upgrading from an Earlier Serviceguard Release” (page 55) , and Appendix D of
Managing Serviceguard, at http://www.docs.hp.com -> High Availability
-> Serviceguard.
Mixed Hardware Architecture
As of HP-UX 11i v2 Update 2 (0409) and Serviceguard A.11.16, Serviceguard supports
mixed-hardware-architecture clusters, consisting of HP 9000 and Integrity servers.
Mixed-hardware-architecture clusters support the same volume managers, at the same
version level, as Serviceguard clusters in which the server hardware is of a single type.
The following restrictions apply:
• Except during a rolling upgrade, all nodes must be running:
— The same HP-UX version
Release Notes Revisions 45