If you adjusted the LUN queue depth, change the Disk.SchedNumReqOutstanding parameter, so that its value matches the queue depth. The parameter controls the maximum number of outstanding requests that all virtual machines can issue to the LUN.

Change this parameter only when you have multiple virtual machines active on a LUN. The parameter does not apply when only one virtual machine is active. In that case, the bandwidth is controlled by the queue depth of the storage adapter.


Browse to the host in the vSphere Web Client object navigator.


Click the Manage tab and click Settings.


Under System, click Advanced System Settings.


Scroll to Disk.SchedNumReqOutstanding and click the Edit icon.


Change the parameter value to the number of your choice and click OK.