To allocate a new UADS using ISPF/PDF, enter ISPF/PDF option 3.2, and allocate a partitioned data set whose name is different from the name of the existing UADS. To allocate a new UADS using a batch job, include the data set attributes on the DD statement for the new data set.

Figure 1 shows an example of using a batch job to allocate the new UADS. A logical record length (LRECL) of 172 is suggested but not required. The block size must be a multiple of the logical record length and greater than or equal to 256. Optimize the block size to minimize wasted space by following the instructions for optimization in the introduction to Chapter 22, "Working with UADS and the Broadcast Data Set."

//jobname  JOB  job card parameters
//         EXEC PGM=IEFBR14
//SYSUT2   DD   DSN=new.UADS.name,UNIT=unit,VOL=SER=volser,
//          DISP=(NEW,CATLG),SPACE=(TRK,(?,?,?)),
//          DCB=(RECFM=FB,LRECL=172,BLKSIZE=1720,DSORG=PO)
/*