HP Serviceguard for Linux Version A.11.16 Release Notes, Third Edition, August 2006

Serviceguard for Linux Version A.11.16 Release Notes
Compatibility Information and Installation Requirements
Chapter 1 31
Upgrades” on page 43 before you start the upgrade, and keep in mind
that the entire upgrade process has to complete successfully before
you can use any Serviceguard commands.
CAUTION If a failure occurs on one node while you are upgrading another,
packages - and the applications they contain - may not be able fail
over to the node being upgraded.