DFSMSrmm provides USERMODs for use when updating JES3 fetch and mount messages with shelf location and pool information.

When you are using EDG_EXIT100 for scratch pooling as described in Using the DFSMSrmm EDG_EXIT100 installation exit, use the EDG3UX71 USERMOD to ensure the correct tape pool is requested.

In a JES3 complex all systems running DFSMSrmm must have the same EDG_EXIT100 installation exit and the same parmlib VLPOOL operand values to ensure that a scratch volume is not rejected because it is from the wrong pool. DFSMSrmm also provides USERMODs EDG3LVVR and EDG3IIP1 that you can use to ensure that the correct tape pool is requested. If you do not use one of the USERMODs which allows DFSMSrmm to update a message or tape display, DFSMSrmm cannot provide tape pool information and the wrong tape pool might be requested. Any incorrect tape mounted is rejected by DFSMSrmm volume validation and a remount requested. The remount request does use the correct pool.