z/OS DFSMSdfp Storage Administration
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Initializing read-only variables

z/OS DFSMSdfp Storage Administration
SC23-6860-01

SMS derives the values of read-only variables before it invokes the ACS routines. The values are based on what is known at the time of the allocation request (for example, if a unit name has been specified on the allocation request, then the &UNIT variable contains the specification).

Exception: &DSNTYPE is not initialized with the DSNTYPE default specified in the IGDSMSxx member in SYS1.PARMLIB.
Parent topic: Using read-only variables

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