Managing Serviceguard Eighteenth Edition, September 2010

Performing a Rolling Upgrade
Limitations of Rolling Upgrades
The following limitations apply to rolling upgrades:
CAUTION: Stricter limitations apply to an upgrade to A.11.19; do not proceed with
an upgrade to A.11.19 until you have read and understood the Special Considerations
for Upgrade to Serviceguard A.11.19 (page 447).
• During a rolling upgrade to a release other than A.11.19, you can issue
Serviceguard commands, but should execute commands other than cmrunnode
and cmhaltnode only on a node containing the latest revision of the software.
Performing tasks on a node containing an earlier revision of the software will not
work or will cause inconsistent results.
• You cannot modify the hardware configuration—including the cluster’s network
configuration—during rolling upgrade.
• You cannot modify the cluster or package configuration until the upgrade is
complete.
If you need to modify the configuration (for example, to take advantage of new
features), upgrade all nodes to the new release, then modify the configuration file
and copy it to all the nodes.
NOTE: This means that you cannot migrate to the HP-UX 11i v3 agile addressing
scheme for device files during a rolling upgrade if cluster lock disks are used as
a tie-breaker, because that involves changing the cluster configuration. See
“Updating the Cluster Lock Configuration” (page 364) for instructions in this case.
See “About Device File Names (Device Special Files)” (page 106) for more
information about agile addressing.
• None of the features of the newer release of Serviceguard are allowed until all
nodes have been upgraded.
• Binary configuration files may be incompatible between releases of Serviceguard.
Do not manually copy configuration files between nodes.
• No more than two versions of Serviceguard can be running in the cluster while
the rolling upgrade is in progress.
• Rolling upgrades are not intended as a means of using mixed releases of
Serviceguard or HP-UX within the cluster. HP strongly recommends that you
upgrade all cluster nodes as quickly as possible to the new release level.
• You cannot delete Serviceguard software (via swremove) from a node while a
rolling upgrade is in progress.
Performing a Rolling Upgrade 451