>- DCB= is *not* ignored when coded with DUMMY. Witness the original
>question. There was a functional difference between DUMMY,BLKSIZE=129
>and DUMMY,BLKSIZE=0.
>- There is no functional distinction between DUMMY and DSN=NULLFILE. The
>JCL manual quote that I cited in my uninteresting post would seem to
>confirm that.
>From the JCL Reference Manual (z/OS 1.6):
Example 2
//IN1 DD DUMMY,DCB=(BLKSIZE=800,LRECL=400,RECFM=FB)
DD statement IN1 defines a dummy data set. The DCB parameter supplies data
control block information not supplied in the program. Without it, the step
might be abnormally terminated.
12.24.2 Parameters on DD DUMMY Statements
* Code the DUMMY parameter by itself or follow it with all the
parameters you would normally code when defining a data set, except the
DDNAME parameter.
* Code the DCB parameter, if needed. If the program does not supply
all the data control block information, make sure that the DCB parameter
supplies the missing information.
2.22.2.9 Data Set Name for Dummy Data Set
NULLFILE
Specifies a dummy data set. NULLFILE has the same effect as coding the DD
DUMMY parameter. NULLFILE must be coded as a single-word parameter. For
instance, IBM does not support the use of NULLFILE to obtain a dummy data
set for these (or other) formats:
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