In a rolling upgrade, you upgrade the
HP-UX operating system (if necessary) and the Serviceguard software
one node at a time without bringing down your cluster. A rolling
upgrade can also be done any time one system needs to be taken offline
for hardware maintenance or patch installations.
This method is the least disruptive, but your cluster must
meet both general and release-specific requirements. See “Guidelines
for Rolling Upgrade”.
In a non-rolling upgrade, you halt the cluster before upgrading
HP-UX (if necessary) and the Serviceguard software.
This method involves cluster down time, but allows for a broader
range of upgrades than rolling upgrade. For example, you will need
to do a non-rolling upgrade, or a migration with cold install, if
you are upgrading from an older release of Serviceguard than rolling
upgrade supports (see the Release Notes for the target version of
Serviceguard for the specific rolling upgrade requirements).
with Cold Install
A cold install involves an installation or re-installation
of HP-UX. It erases the current operating system and data and then
installs the new operating system and software; you must then restore
The advantage of migrating with cold install is that the software
can be installed without regard for the software currently on the
system or concern for cleaning up old software.