SPACSWIR—reduce initial allocation on volume addition (used with StopX37/II)


Related topic

BMC-AMI-Storage-StopX37-II-functions

The SPACSWIR function allows the initial allocation on an added volume to be reduced, thereby allowing the volume addition to proceed even if not enough space is available to satisfy the size that was originally requested.

An alternative function, SPACSECR, allows secondary extent reduction but can cause a data set to be extended on numerous small extents on the current volume. With SPACSWIR, when the size that was originally requested is not available on the current volume, secondary extents can be directed to an additional volume without first exhausting smaller extents on the current volume, thus reducing fragmentation.

When a volume addition has been requested by z/OS, SPACSWIR works in conjunction with SPACVOLA to decrease the initial requested allocation to the size of the largest contiguous extent on all of the available volumes.

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