Home > Storage > PowerScale (Isilon) > Product Documentation > Storage (general) > PowerScale OneFS Best Practices > Introduction
In a clustered architecture, there are cluster jobs that are responsible for taking care of the health and maintenance of the cluster itself—these jobs are all managed by the OneFS Job Engine. The Job Engine runs across the entire cluster and reduces a task into smaller work items. It then allocates these items to multiple worker threads on each node. Jobs are typically run as background tasks across the cluster, using spare or especially reserved capacity and resources. The jobs themselves can be categorized into three primary classes, as described in File system maintenance jobs, Feature support jobs, and User action jobs.