Managing Serviceguard Sixteenth Edition, March 2009

and finished upgrading the node to the new cluster manager (Cluster Membership
Protocol version 2), and then, once all nodes have been upgraded, you will see
a message indicating that the new cluster has formed. Watch for three messages similar
to the following (for clarity, intervening messages have been replaced with ellipses
[...]):
Nov 14 13:52:46 bbq1 cmcld[20319]: Starting to upgrade this node to Cluster Membership Protocol
version 2
[....]
Nov 14 13:52:46 bbq1 cmcld[20319]: Finished upgrading this node to Cluster Membership Protocol version
2
[....]
Nov 14 13:52:47 bbq1 cmcld[20319]: Membership: membership at 3 is FORMED (coordinator 1) includes:
1 3 2 4 excludes
When you see the Membership: message, and specifically the capitalized word FORMED
in this message, the transition to the new cluster manager is complete and you can use
all the Serviceguard commands.
Types of Upgrade
Rolling Upgrade
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” (page 409).
Non-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).
Migration 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 data.
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.
408 Software Upgrades