z/OS DFSMS Software Support for IBM System Storage TS1140, TS1130, and TS1120 Tape Drives (3592)
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MVS device allocation modifications

z/OS DFSMS Software Support for IBM System Storage TS1140, TS1130, and TS1120 Tape Drives (3592)
SC23-6854-00

MVS device allocation helps prioritize and select tape drives to meet the needs of application programs or system functions. Batch (JCL) or dynamic (SVC99) allocation makes these device needs known to MVS device allocation. MVS device allocation selects the appropriate devices and serializes them for the requester to use. It can also request that appropriate volumes be mounted on the allocated devices. It accomplishes these tasks by interfacing with SMS, DEVSERV, OAM, MSGDISP, and other system components.

MVS device allocation currently supports multiple types of tape devices. Within an IBM tape library environment, MVS device allocation considers media types and recording technologies when allocating tape drives and tape volumes. The dynamic allocation (SVC 99) volume interchange text unit (DALINCHG) allows you to specify EFMT1 the recording technology and MEDIA5, MEDIA6, MEDIA7, or MEDIA8 for the media type and EFMT2 for the recording technology and MEDIA5, MEDIA6, MEDIA7, MEDIA8, MEDIA9 and MEDIA10 for the media type. Specification of MEDIA9 or MEDIA10 is only supported on z/OS V1R5 and above.

MVS device allocation:
  • Allows you to specify the new media types (MEDIA9, MEDIA10) through Dynamic Allocation Text Unit DALINCHG at z/OS v1r5 and greater.
  • Allows the new recording format (EFMT2) to be used with existing media types MEDIA5-MEDIA8 (at all supported releases) and the new media types MEDIA9 and MEDIA10 (at z/OS v1r5 and greater).

See Table 1 for DALINCHG parameter values.

Table 1. Dynamic allocation (DALINCHG) parameter values for tape cartridge media types
Parameter value Media type Recording technology
75 MEDIA5 EFMT2
65 MEDIA5 EFMT1
05 MEDIA5 No format
76 MEDIA6 EFMT2
66 MEDIA6 EFMT1
06 MEDIA6 No format
77 MEDIA7 EFMT2
67 MEDIA7 EFMT1
07 MEDIA7 No format
78 MEDIA8 EFMT2
68 MEDIA8 EFMT1
08 MEDIA8 No format
79 MEDIA9 EFMT2
09 MEDIA9 No format
7A MEDIA10 EFMT2
0A MEDIA10 No format
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