Database - RAC/Scalability (MOSC)

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OS Kernel patching on a RAC setup

edited Feb 13, 2011 9:32PM in Database - RAC/Scalability (MOSC) 3 commentsAnswered
We have a whole bunch of 2-node RAC databases running on Oracle 11gr2 (11.2.0.1), on Oracle Enterprise Linux 5.5. The infrastructure team is planning on applying security patches on the Linux OS. What is the recommended way of applying the OS kernel patches? We are not using Grid Control Deployment procedures at this point in time.
I believe a 'rolling' OS Kernel patch on the nodes, one at a time, while the other one is alive, is not recommended. Or am I wrong? My understanding is that all nodes in the cluster must be operating at exactly the same version of the kernel/patch. If this were true, we cannot do any 'rolling' os-level patches. Having said this, perhaps it depends on the nature of the patch being applied, or does it?

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