SPACCONV—change allocation units to blocks (used with Allocation)


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Using-Allocation-functions

The SPACCONV function converts space allocation values on new allocations from cylinders or tracks to blocks, for both primary and secondary allocation quantities.

The advantage of space allocation in blocks is that the system determines the necessary number of tracks or cylinders to hold the requested number of blocks, taking into account the device type. For allocation in cylinders or tracks, the size of the allocation varies with the device type.

SPACCONV is useful for allocating the correct amount of space when new device types are put into use, such as converting from 3380 to 3390 devices. The old device type (for which the JCL space parameters are coded) is identified by the TRKLEN and TRKCYL parameters. SPACCONV automatically converts track and cylinder space requests into blocks. z/OS applies the blocks during allocation to the new device type, thereby allocating a proportionally larger or smaller total space.

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