The IBM TotalStorage 3494 Tape Library is IBM's main cartridge tape library for the mainframe. The IBM 3494 also supports connectivity to open systems and is the framework for IBM's virtual tape system, the IBM TotalStorage 3494 Virtual Tape Server (VTS). This section describes how to configure CA TLMS with the IBM 3494 Tape Library. For information on configuring CA TLMS with the IBM 3494 VTS, see the section entitled "IBM 3494 Virtual Tape Server (VTS)" below.
Integration between CA TLMS and the IBM 3494 Tape Library (ATL) or the IBM 3494 VTS is based on four exits that are used to communicate with the robot:
Object Access Method (OAM) is a part of IBM's DFSMSdfp component and is designed to provide management of data objects rather than files. OAM is also used to manage IBM's tape libraries as part of an overall storage hierarchy, based on DFSMS System Managed Storage concepts and facilities. OAM includes an address space that runs on z/OS which provides object related services for applications as well as entry, eject, and related processing for tape libraries. The OAM address space also maintains the Tape Configuration Database (TCDB) which defines the IBM tape volumes and libraries managed. The TCDB is made up of one or more VOLCATs, a special type of ICF.CATALOG which is specifically marked as a volume catalog.
OAM includes a component, Library Control Services (LCS) which is used to manage the movement and tracking of tapes in IBM automated tape libraries. CA TLMS interfaces to OAM through requests made to LCS.
To configure your installation to access the IBM 3494 for basic type library support you must customize the OAM exits CBRUXENT and CBRUXEJC. The CBRUXVNL exit is optional. CA recommends that the CA TLMS scratch exit TLMSRACF be installed to synchronize scratch status between CA TLMS and TCDB, however this may also be achieved by implementing batch synchronization procedures. A discussion of the processing in each exit follows. Note that additional calls to these exits are performed when an IBM 3494 VTS is being managed.
The additional calls related to virtual tape processing are discussed in the section entitled "IBM 3494 Virtual Tape Server (VTS)" below.
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