Managing Serviceguard 11th Edition, Version A.11.16, Second Printing June 2004

Rolling Software Upgrades
Appendix E 391
E Rolling Software Upgrades
You can upgrade the HP-UX operating system and the Serviceguard
software one node at a time without bringing down your clusters. This
process can also be used any time one system needs to be taken offline for
hardware maintenance or patch installations. Until the process of
upgrade is complete on all nodes, you cannot change the cluster
configuration files, and you will not be able to use any of the features of
the new Serviceguard release.
Rolling upgrade is supported with any of the supported revisions of
Serviceguard. You can roll forward from any previous revision to any
higher revision. For example, it is possible to roll from Serviceguard
version A.10.05 on HP-UX 10.10 to version A.11.15 on HP-UX 11.11.
The sections in this appendix are as follows:
• Steps for Rolling Upgrades
• Example of Rolling Upgrade
• Limitations of Rolling Upgrades