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I know this is not an easy task, as it is time-consuming and needs additional hardware only for testing. But when really business-critical applications are running on the cluster, it is very good to now that the cluster works fine also with new updates installed on the hardware node. In many cases a dedicated test cluster and the time efford for the testing of updates may cause too much costs. If you cannot do such test of updates, keep in mind that over time (when you must install security updates of the OS or the kernel) you have a cluster that you have not tested in this configuration.
If you need a tested cluster (also with tested kernel updates), you may take a look on this Virtuozzo cluster: [http://criticalessayresearch-essay-writing-examples.weeblytumblr.com/ censorious research essays], [http://classsification-essay-writingcontrastessay.blinkwebwikidot.com/ categorization essaycontrastessay], http://www.thomas-krenn.com/cluster.
== How to do OpenVZ kernel updates when it contains a new DRBD version ==