Unused space is released from ESDS and KSDS VSAM type data sets only. Selection for release processing is by cluster name or alternate index, not at the VSAM component level. Only VSAM data sets cataloged in ICF catalogs are selected. The Release function does not process VSAM data sets with more than 12 extents.
Space is released from the data and index components for KSDS data sets and from the data component for ESDS data sets. A new HARBA (High Allocated Relative Byte Address) value is calculated for the VSAM data set. The calculation uses the percentage that you specify, the HURBA (High Used Relative Byte Address) value, and the Control Area boundary. The new HARBA must be on a Control Area boundary. After the new HARBA value is calculated, the amount of physical space to release from the last extent is determined. The unused space is released only from the last extent used. The VTOC and the catalog are updated to reflect these changes.
The percentage-used value that you specify is applied against the HARBA and HURBA values of the VSAM data set. The value is not applied to the physical space allocation of the data set. The amount of physical space that is released cannot correspond to the percentage specified by you. For more information, see the Sample RELEASE Report.
The PCTSECONDARY and CONVERT DSCL RELEASE action command parameters are not valid for VSAM data sets, and are ignored. Since the PCTSECONDARY parameter value is ignored, you cannot display it on the Idle Space Release report for VSAM data sets.
CA Disk can convert the VSAM indexes that are allocated by cylinder to track allocation. Since the CONVERT parameter is ignored for VSAM, the conversion occurs without regard to the value specified for the parameter. This can be done only if the following conditions are true:
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