z/OS DFSMShsm Implementation and Customization Guide
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Changing the primary space quantity

z/OS DFSMShsm Implementation and Customization Guide
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You can specify the number of tracks to be allocated as the primary space quantity for the specified (or default) unit. An example: 
PATCH .MCVT.+4B0 X'001E' VERIFY(.MCVT.+4B0 X'0014')
/* Primary space qty for ODS allocation = 30 tracks */

DFSMShsm uses a default primary allocation of 20 tracks.

Note: If you use the OUTDATASET option for this PATCH command, the patch does not affect that allocation.
Parent topic: Changing the allocation parameters for an output data set

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