Storage DRS allows you to manage the aggregated resources of a datastore cluster. When Storage DRS is enabled, it provides recommendations for virtual machine disk placement and migration to balance space and I/O resources across the datastores in the datastore cluster.

About this task

When you enable Storage DRS, you enable the following functions.

  • Space load balancing among datastores within a datastore cluster.

  • I/O load balancing among datastores within a datastore cluster.

  • Initial placement for virtual disks based on space and I/O workload.

The Enable Storage DRS check box in the Datastore Cluster Settings dialog box enables or disables all of these components at once. If necessary, you can disable I/O-related functions of Storage DRS independently of space balancing functions.

When you disable Storage DRS on a datastore cluster, Storage DRS settings are preserved. When you enable Storage DRS, the settings for the datastore cluster are restored to the point where Storage DRS was disabled.


  1. Browse to the datastore cluster in the vSphere Web Client navigator.
  2. Click the Configure tab and click Services.
  3. Select Storage DRS and click Edit.
  4. Select Turn ON vSphere DRS and click OK.
  5. (Optional) To disable only I/O-related functions of Storage DRS, leaving space-related controls enabled, perform the following steps.
    1. Under Storage DRS select Edit.
    2. Deselect the Enable I/O metric for Storage DRS check box and click OK.