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OAM object tape support z/OS DFSMS Software Support for IBM System Storage TS1140, TS1130, and TS1120 Tape Drives (3592) SC23-6854-00 |
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The Object Access Method (OAM) is also an access method supporting a class of data referred to as objects. An object is a named stream of bytes. The content, format, and structure of that byte stream are unknown to OAM. There are no restrictions on the data in an object. For example, an object can be a compressed scanned image or coded data. Objects are different from data sets handled by existing access methods. In an IBM® tape library environment, the SETOAM DATACLASS parameter can be specified using a data class that contains the media type or recording technology; these specifications are associated with an Object or Object Backup storage group in the CBROAMxx member of PARMLIB. In a stand-alone environment, the SETOAM TAPEUNITNAME parameter can be specified using an esoteric that contains 3592 Model J devices. These specifications are associated with an Object or Object Backup storage group in the CBROAMxx member of PARMLIB. In addition, the SETOAM DATACLASS parameter can also be used inside and outside an IBM tape library environment to take advantage of performance scaling. Performance scaling is only available with MEDIA5 (300GB) tape cartridge media. A DATACLASS with the performance scaling data class attribute selected can be specified for OBJECT storage groups to improve the random retrieval rate of primary objects; whereas, objects written to OBJECT BACKUP storage groups can specify a DATACLASS that does not specify performance scaling and can continue to utilize the full capacity of the MEDIA5 volume. In addition to the performance scaling option available with the 300GB MEDIA5 cartridge, the 60GB MEDIA7 economy cartridge can also be used to improve the random retrieval rate of primary objects.
Table 1 shows the entry for the optical configuration
database (OCDB) MEDIATYP field. The media type is defined in the MEDIATYP
field. These media types are defined:
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