An administrator receives the following error message: Unmanaged I/O workload detected on shared datastore. Which vSphere feature is the likely source of this error?

Network I/O Control manages bandwidth allocation and prioritization for virtual machine network traffic on vSphere Distributed Switches and has no role in monitoring or managing storage datastore I/O workloads.

Storage I/O Control (SIOC) monitors aggregate I/O latency on shared datastores and uses I/O shares to throttle and prioritize workloads across ESXi hosts. When SIOC detects I/O originating from hosts or entities outside its management scope - such as physical machines or hosts registered to a different vCenter - it raises this specific warning because it cannot enforce equitable I/O distribution across all consumers of the datastore.

Storage DRS uses I/O latency and capacity metrics to recommend or automate virtual machine disk placement across datastores, but it does not monitor for unmanaged I/O sources or produce this specific warning message.

HA datastore heartbeats use datastores as a secondary communication path to detect isolated or failed hosts and do not perform I/O workload monitoring or generate alerts about unmanaged storage traffic.