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Creating a partitioned data set
z/OS TSO/E Primer
A PDS requires a different arrangement of space than a sequential data set. The PDS consists of two parts. One part contains the members. The other part is a directory of all the members and where they are located.
The steps for creating a PDS are the same as creating a sequential data set, except you specify space for the directory. After selecting the DATASET option (option 2) from the Utility Selection Menu, type A on the OPTION line and specify three data set qualifiers in the three ISPF LIBRARY fields. You don't name members at this time. You name members on the edit panel one at a time as you add them.
A PDS requires a different arrangement of space than a sequential data set. In the following example, notice that the DIRECTORY BLOCKS field has a value of 12. A sequential data set must have a value of 0 in this field. A general rule is to allow one directory block for every six members in a PDS.
The previous panel shows an example of values for a PDS. However, you might want to find out the values your installation recommends.
To review what the allocate fields represent, see Allocate New Data Set of Creating a sequential data set. For more information about these fields, press the HELP PF key (PF 1) while the Allocate New Data Set panel is displayed, or see z/OS TSO/E User's Guide.
Copyright IBM Corporation 1990, 2014