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corrected a broken footnote →Bofore going in production: testing, testing, testing, and ...hm... testing!
As mentioned above, some problems only arise after an outage lasts longer than some minutes. So do the tests also with a duration of >1h for example.
Before you start to test, build a test plan. Some valueable information on that can be found in chapter 3 "Testing a highly available Tivoli Storage Manager cluster environment" of the Redbook ''IBM Tivoli Storage Manager in a Clustered Environment''<ref>, see http://www.redbooks.ibm.com/abstracts/sg246679.html</ref>. In this chapter it is mentioned that the experience of the authoring team is that the testing phase must be at least two times the total implementation time for the cluster.
== Bofore installing kernel updates: testing again ==
