Clarify driver and MIG setup for DRA

Author: empovit

demo/clusters/openshift/README.md

@@ -20,23 +20,16 @@ $ oc patch --type merge -p '{"spec":{"profile": "HighNodeUtilization", "profileC
 
 The easiest way to install NVIDIA GPU drivers on OpenShift nodes is via the NVIDIA GPU Operator.
 
-**Be careful to disable the device plugin so it does not conflict with the DRA plugin**. It is recommended to leave only the NVIDIA GPU driver and driver toolkit configs, and disable everything else:
+**Be careful to disable the device plugin so it does not conflict with the DRA plugin**:
 
 ```yaml
-  <...>
   devicePlugin:
     enabled: false
-  <...>
-  driver:
-    enabled: true
-  <...>
-  toolkit:
-    enabled: true
-  <...>
 ```
 
+Keep in mind that the NVIDIA GPU operator is needed here only to install NVIDIA binaries on the cluster nodes, and should not be used for other purposes such as configuring GPUs.
 
-The NVIDIA GPU Operator might not be available through the OperatorHub in a pre-production version of OpenShift. In this case, deploy the operator from a bundle or add a certified catalog index from an earlier version of OpenShift, e.g.:
+The operator might not be available through the OperatorHub in a pre-production version of OpenShift. In this case, deploy the operator from a bundle or add a certified catalog index from an earlier version of OpenShift, e.g.:
 
 ```yaml
 kind: CatalogSource
@@ -139,4 +132,6 @@ Enabled MIG Mode for GPU 00000000:0A:00.0
 All done.
 ```
 
-Make sure to stop everything that may hold the GPU before enabling MIG. Otherwise you will see a warning, and the MIG status will have an asterisk (i.e. `Enabled*`), meaning that the setting could not be applied.
+Make sure to stop everything that may hold the GPU before enabling MIG. Otherwise you will see a warning, and the MIG status will have an asterisk (i.e. `Enabled*`), meaning that the setting could not be applied.
+
+No MIG devices must be pre-configured on the GPU if it is going to be used with DRA &mdash; the DRA driver will configure MIG automatically on the fly.