Storage I/O Control (SIOC) allows administrators to control the storage I/O consumption by virtual machines.

On the datastore level, SIOC takes care of distributing I/O resources between running VMs so that a single VM cannot monopolize a datastore.

On the VM level, this feature allows limiting the amount of I/O available to a particular virtual machine.

vCenter is required only to enable the SIOC feature. Once enabled, SIOC does not need vCenter to run.

By default, SIOC is disabled. First, it should be enabled for datastores. Unfortunately, it has to be done for each datastore separately. When enabling SIOC, you will be able to configure the latency threshold. SIOC does not engage until this threshold is reached. By default, it is 30 milliseconds.