The Object Access Method (OAM) is a component of DFSMSdfp. OAM uses the concepts of system-managed storage, introduced by SMS, to manage, maintain, and verify tape volumes and tape libraries within a tape storage environment. You can also use OAM's object support to manage objects on DASD, tape, and optical volumes.

Related reading:

• See z/OS DFSMS OAM Planning, Installation, and Storage Administration Guide for Tape Libraries for additional information about using OAM to manage tape volumes and tape libraries.
• See z/OS DFSMS OAM Planning, Installation, and Storage Administration Guide for Object Support for additional information about using OAM to manage the data on tape volumes.
• See z/OS MVS System Messages, Vol 4 (CBD-DMO) for explanations and appropriate actions for CBRxxxxx messages.