Using Serviceguard Extension for RAC, 5th Edition, June 2007

Software Upgrades
Appendix A240
One advantage of both rolling and non-rolling upgrades versus cold
install is that upgrades retain the pre-existing operating system,
software and data. Conversely, the cold install process erases the
pre-existing system; you must re-install the operating system, software
and data. For these reasons, a cold install may require more downtime.
The sections in this appendix are as follows:
• Rolling Software Upgrades
— Steps for Rolling Upgrades
— Example of Rolling Upgrade
— Limitations of Rolling Upgrades
• Non-Rolling Software Upgrades
— Steps for Non-Rolling Upgrades
— Limitations of Non-Rolling Upgrades
• Migrating a SGeRAC Cluster with Cold Install