Using Serviceguard Extension for RAC, 6th Edition, April 2008

Figure A-6 Running Cluster After Upgrades
Limitations of Rolling Upgrades
The following limitations apply to rolling upgrades:
• During a rolling upgrade, you should issue Serviceguard/SGeRAC 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 cluster or package configuration until the upgrade is
complete. Also, you cannot modify the hardware configuration—including the
cluster’s network configuration—during a rolling upgrade. This means that you
must upgrade all nodes to the new release before you can modify the configuration
file and copy it to all nodes.
• The new features of the Serviceguard/SGeRAC release may not work until all
nodes have been upgraded.
• Binary configuration files may be incompatible between releases of
Serviceguard/SGeRAC. Do not manually copy configuration files between nodes.
• Within a Serviceguard/SGeRAC cluster, no more than two versions of Serviceguard
and SGeRAC can be running while the rolling upgrade is in progress.
Rolling Software Upgrades 175