A suggestion: In place of the DDR on the S disk, use CMSDDR (downloadable from the VM Download library at www.vm.ibm.com/download), and dump the volumes to a CMS file with a meaningful name (like <vaddr> <date>). Then you can use TAPE DUMP or MOVEFILE to move the files to tape (also gives you SL multivolume tape support, which DDR doesn't do).
This gives you a easy way to scan the tapes for a particular volume using CMS utilities (TAPEMAP is your friend) and generate listings of what disk volume is on what tape. Costs you a free disk volume, but it makes life a LOT easier if all you have is the basic system. Be sure to put a copy of DDR2CMSX MODULE as the first file on the tape to ensure you have it in DR situations. You also may want to look into getting a copy of IBM's Backup Manager. While it's fairly difficult to set up, it is reasonably priced and provides a way to automate dumps without breaking the bank.
