The ability to add and remove both volume ranges and DSNB’s without stopping any tape processing is a great productivity enhancement. However, you still need to make sure that all steps are followed and correctly preparing for the execution of TMSXTEND makes the entire job a lot less error-proof.
This video (created by WITRU02) will go through the recommended steps you should follow prior to actually executing TMSXTEND to insure that the final execution is completed pain-free.