If OAM is waiting for the mount of a volume after the appropriate device has been allocated and the five minute default or the time specified on the MOUNTWAITTIME parameter of the SETOAM statement has elapsed with no mount occurring, message CBR6405D is issued to the operator to ask if the mount should be retried or canceled. If the operator replies R, the mount message is left on the console until the installation-specified amount of time (MOUNTWAITTIME) has again elapsed or the mount has been completed. This process continues until the requested volume is mounted or until the operator replies C. Should the operator cancel the request, one or more of the following actions occur:

• Message CBR2003I, stating that the tape volume that was requested to be mounted was not found, and is marked lost, is issued.
  Note: This message is not issued for an MVS scratch tape mount that is used to satisfy the request. This message is only issued for tape volumes that have rows in the TAPEVOL table.
• OAM marks the volume as lost so that future and current read requests for this volume fail with a nonzero return and reason code. For more information, see Displaying volumes that have LOSTFLAG set.
• If the request that required the mount was a write request with a corresponding row in the TAPEVOL table, OAM marks the volume as lost. OAM tape volume selection attempts to find another volume for the request. If the cancellation was for an MVS scratch tape, OAM fails the request.