Preventing aggregate roll off and tape expiration

When you create a new version of an aggregate group, ABARS ensures that the number of versions kept does not exceed the number specified in the NUMBER OF VERSIONS attribute in the Management Class. If NUMBER OF VERSIONS is exceeded, ABARS rolls off (deletes) the oldest version of that aggregate and the activity logs associated with it. When an aggregate group is removed during roll-off processing, the output files (C, D, O, and I) associated with that aggregate, are located in the catalog, and a list of volume serial numbers that these files reside on, is requested. When necessary, the volumes are deleted from the RACF® HSMABR tape volume set. When you stack multiple aggregates on a tape unbeknownst to ABARS, you need to prevent aggregate roll-off processing from occurring. If you allow aggregate roll-off, the tape associated with the oldest aggregate might expire, even though it still contains valid stacked aggregates.

To prevent aggregate roll-off from occurring automatically, change the # Versions field in the ISMF Management Class Alter panel to the value of NOLIMIT. Figure 1 shows the updated value in the # Versions field that prevents aggregate roll-off.

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                         MANAGEMENT CLASS ALTER                               Page 5 of 5
Command ===>

SCDS Name . . . . . . : HSMATH0.AB1H0PC6.SCDS
Management Class Name : MCLASS1

To ALTER Management Class, Specify:
   AGGREGATE Backup Attributes:
      # Versions . . . . . . . . NOLIMIT   (1 to 9999, NOLIMIT or blank)
      Retain Only Version . . .            (1 to 9999, NOLIMIT or blank)
        Unit . . . . . . . . . .           (D=days, W=weeks, M=months, Y=years or
                                           blank)
      Retain Extra Versions . .            (1 to 9999, NOLIMIT or blank)
        Unit . . . . . . . . . .           (D=days, W=weeks, M=months, Y=years or
                                           blank)
      Copy Serialization . . . .           (C=continue, F=fail or blank)
      Abackup Copy Technique . . S         (P, R, S, VP, VR, CP or CR



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