Jun 112013
 

This will enable Storage IO Control for all datastores that exist within a datastore cluster for the entire vcenter.
Edit as needed:

set-datastore -datastore (Get-DatastoreCluster | get-datastore) -StorageIOControlEnabled $true

 

Quick edits if you want a narrow scope:
Single Cluster:
set-datastore -datastore (Get-DatastoreCluster “MyStorageCluster”| get-datastore) -StorageIOControlEnabled $true

With a filter to only change datastores with “ThisText” in the name:
set-datastore -datastore (Get-DatastoreCluster | get-datastore | where {$_.name -match “ThisText”}) -StorageIOControlEnabled $true

 

Vmware Links:
http://www.vmware.com/support/developer/PowerCLI/PowerCLI51/html/Set-DatastoreCluster.html
http://www.vmware.com/support/developer/PowerCLI/PowerCLI51/html/Get-Datastore.html