(UNIX systems) Backup Server requests a volume change when the tape capacity has been reached. After mounting another volume, the operator notifies Backup Server by executing sp_volchanged on any SAP ASE server that can communicate with Backup Server.
If Backup Server detects a problem with the currently mounted volume, it requests a volume change by sending messages to either the client or its operator console. The operator can use the sp_volchanged system procedure to respond to these messages.