The MVS™ system keeps some WTO and WTOR messages in buffers in virtual storage. The WTO buffers hold the messages that the system has not yet displayed at the eligible consoles; the WTOR buffers each hold one WTOR message that the system has already displayed but that an operator has not responded to. The maximum number of WTO and WTOR buffers are determined by the MLIM and RLIM parameters on the INIT statement in the CONSOLxx parmlib member. If these parameters are not coded, the system defaults (as described in z/OS MVS Initialization and Tuning Reference) are in effect.
To avoid WTO message buffer shortages, you can raise your WTO buffer limit (MLIM) and adjust message deletion specifications on your consoles. To avoid WTOR message buffer shortage, raise your WTOR buffer limit (RLIM) and reply to WTORs more frequently. Procedures for responding to WTO and WTOR buffers shortages follow in this topic.