- The first diagnostic step is to run a fresh cluster validation check. For details on validation, see [Failover Cluster Step-by-Step Guide: Validating Hardware for a Failover Cluster](/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/cc732035(v=ws.10)). This can be completed without any interruption of service as it does not affect any online cluster resources. Validation can be run at any time once the Failover Clustering feature has been installed, including before the cluster has been deployed, during cluster creation and while the cluster is running. In fact, additional tests are executed once the cluster is in use, which check that best practices are being followed for highly-available workloads. Across these dozens of tests, only a few of them will impact running cluster workloads and these are all within the storage category, so skipping this entire category is an easy way to avoid disruptive tests.
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