Many of you will be aware that Storage DRS uses Storage I/O Control (SIOC) for load balancing based on I/O metrics. However a statement in one of our white papers has raised a few questions recently with both our customers and partners. The statement is as follows:
This assertion led many to believe that Storage DRS would not work well with Adaptive Queuing (AQ), another of VMware’s queue depth throttling mechanisms. However internally, many felt that this wasn’t a true statement, but some work was needed to verify that it would not cause any issues. This led to a number of tests being run with Storage DRS and both of our queue throttling features, SIOC and Adaptive Queuing. I am using this post to share those results.
Another feature which was introduced in vSphere 5.1 & vCloud Director 5.1 was the interoperability between vCloud Director & Storage DRS. Now vCloud Director can use datastore clusters for the placements of vCloud vApps, and allow Storage DRS do what it does best – choose the best datastore in the datastore cluster for the initial placement of the vApp, and then load balance the capacity and performance of the datastores through the use of Storage vMotion.