Database Reference
In-Depth Information
Figure 6.29
Storage congestion without SIOC.
With Storage IO Control activated, the proportional share of resources and fairness are
enforced across all hosts and for all VMs that share the same data store. In the example
shown in
Figure 6.30
, SIOC takes action to reduce the queue depth that the less
important VM has access to and to ensure that the most important VM gets its full
entitlement to the available IO resources of the data store. Because Storage IO Control
is only going to become active when there is congestion on the data stores, it is perfectly
safe to use with array auto-tiering. SIOC will simply balance out the latency while the
array moves blocks around if the operations cause any latency spikes.
