Select an available device of the type required and respond R xx,dev, where xx is the reply number and dev is the device number of the selected device. You may also respond by signalling EOB (pressing the enter key on the console). This action indicates that the volume is not available and is not to be used for this initial program load (IPL). If you are receiving this message unexpectedly, verify that your IODF configuration has a DEVICE definition for the required volser, and the OFFLINE=YES parameter is not specified. OFFLINE=YES will cause the device to be offline at IPL.