One important aspect of monitoring overlooked in most environments is ensuring that the tools you are using to monitor are up and running. In the event of a problem with your monitor tools, how will you monitor your environment? Remember that essential Windows services, such as RPC for a server cluster, must be monitored to ensure that they are available. Monitoring these things goes beyond the normal monitoring of a database or a server for performance through System Monitor or SQL Server Profiler. You need to have redundant monitoring systems in place so that your monitoring center will never miss a beat. There is nothing worse than end users or customers experiencing a problem when the people on the other end are unaware because they do not even know the monitoring system is down.