correctly specified. By design, no control loop is provided for ensuring the correct execution of configuration components. Site administrators typically use standard monitoring systems to detect and respond to configuration failures. Nagios and Lemon are both being used at Quattor sites for this purpose. In fact, Lemon has been developed in tandem with Quattor, and provides sensors to detect failures in Quattor component execution. While nodes normally update themselves automatically, administrators can configure the system to disable automatic change deployment. This is crucial in a devolved system where the responsibilities for, respectively, modifying and deploying the configuration may be separated. A typical scenario is that top-level administrators manage the shared configuration of multiple remote sites and local managers apply it according to their policies. For instance, software updates might be scheduled at different times. See also Comparison of open source configuration management software References External links Quattor Homepage Quattor Case Studies StratusLab Project Quattor on Ohloh LISA 08 Paper Journal of Grid Computing Paper Documentation on the Pan language Unix software Configuration management System administration