During a failure, VTAM® places any existing modes and active LU-LU sessions in a recovery pending state and deallocates all active conversations. If VTAM cannot communicate the deallocation to the partner LU, the deallocation is delayed until the conversation state permits VTAM to send the deallocation.
Any data associated with a deallocated conversation is discarded. Newly arriving FMH-5s and any associated data received during the outage are queued for delivery following recovery.
Pending and queued sessions are terminated. If an application program has enabled persistence and fails (or is taken over) during a critical exchange of information on a session, such as a synchronization exchange, VTAM unbinds that session. The unbind permits the LUs to make consistent decisions and ensures continued synchronization between the two LUs.