An administrator observes that virtual machine storage activity on an ESXi 6.x host is negatively affecting virtual machine storage activity on another host that is accessing the same VMFS…

Storage I/O Control monitors datastore latency and automatically throttles I/O from virtual machines across all accessing hosts when congestion thresholds are exceeded, ensuring equitable access for every host sharing that datastore. It operates at the vCenter level to enforce cross-host I/O fairness, directly targeting the described scenario where one host's activity harms another's performance. No other listed option provides this centralized, multi-host I/O arbitration capability.

Storage DRS handles initial VM placement and migration across datastores for capacity and performance balancing, but does not throttle active I/O in real time between multiple hosts accessing the same datastore.

Dynamic Queue Depth Throttling adjusts a single host's queue depth locally based on detected congestion, but it does not coordinate I/O fairness across multiple hosts sharing the same datastore.

Disk.SchedNumReqOutstanding sets the maximum outstanding I/O requests per datastore per host, which can limit one host's throughput but provides no centralized cross-host arbitration comparable to SIOC.