First check the default PSP of a Device.
#esxcli storage nmp device list
Example: As you can see above we have “Fixed” PSP Policy is configured which comes default with VMWARE. Let’s change it to “Round Robin”
#esxcli storage nmp device set –d t10.F405E46494C45425837546174494D2958787E4D284248366 –P VMW_PSP_RR
You can verify your configured PSP settings
#esxcli storage nmp device list (Go to you device and check Path Selection Policy (PSP))
From Webclient ->Home-> Storage-> Select your device (Datastore) -> Manage-> Settings -> Connectivity and Multipathing -> Select the Host -> Click “Edit Multipathing” Button.
Select your Multipathing from Drop Down and Click “OK”
Verify your configured settings