Hello Bad man!
If after V ucbb,OFFLINE you are receiving IEF524I ucbb, VOLUME PRDxxx PENDING OFFLINE â€“ you should issue d ios,config to see the name of your sys1.iodfxx â€“ then go with HC for sys1.iodfxx â€“ 1 (view) â€“ 5 (I/O device) - /ucbb â€“ 8 (view) â€“ etc. until view the parameter OFFLINE YES or NO for this ucbb. The reason is here â€“ if your ucbb is OFFLINE NO, it means that during IPL it is set always to ONLINE. Ask your IPL support to change this parameter to parameter OFFLINE YES and reIPL. Then you will have V ucbb,OFFLINE OK.
Hope this will help!