What is one purpose of extent migrations?

Extent migrations serve the purpose of optimizing storage resource utilization by allowing data stored in extents to be relocated from one storage volume to another, specifically from a high-activity or "hot" storage volume to a volume that experiences less activity. This process can help improve performance by reducing contention on the busy volume, thereby enhancing access speed and efficiency. By redistributing workloads, extent migrations help maintain balanced performance across the storage environment, which is crucial for ensuring that applications running on the storage system experience optimal performance.

The effectiveness of this operation is particularly important in environments where workloads can vary significantly, and therefore, managing where data resides can lead to better overall performance and resource allocation.