new note

Author: skopacz1

modules/installing-ove-rendezvous.adoc

@@ -17,6 +17,12 @@ The rendezvous node runs as the bootstrap host during the installation, which ho
 
 . On the machine that you have designated to be the rendezvous node, attach the ISO image to the machine and boot the machine from this image.
 You can also boot from a USB drive containing the ISO image.
++
+[NOTE]
+====
+If you mount the ISO via a virtual drive, the cluster installation might take several hours to complete.
+Mount the ISO with physical media such as a USB drive to reduce the overall installation time.
+====
 
 . Wait for the machine to boot from the image and display the *Rendezvous node setup* menu.