Home > Storage > PowerScale (Isilon) > Product Documentation > Storage (general) > Dell PowerScale: Considerations and Best Practices for Large Clusters > Constructing an event timeline
When investigating a large cluster issue, it can be helpful to build a human-readable timeline of what occurred. This is particularly useful in instances with multiple, non-simultaneous group changes. This timeline should include which nodes have come up or down and can be interpolated with panic stack summaries to describe an event.