Creating HFS Data Sets

To create an HFS data set, follow these steps:

To allocate the HFS data set, specify HFS in the DSNTYPE parameter and the number of directory blocks in the SPACE parameter, in either the JCL or the data class. If you do not specify the number of the directory blocks, the allocation fails. The value of the number has no effect.
_______________________________________________________________
Define a data class for HFS data sets. Although you can create uncataloged HFS data sets, they must be cataloged when they are mounted. These data sets can expand to as many as 255 extents of DASD space on multiple volumes (59 volumes maximum with 123 extents per volume). Note: HFS expands data sets by five extents at a time, so if an HFS data set has over 250 extents already, it cannot expand further – the maximum number of extents may be between 251 and 255 in that case.
_______________________________________________________________
Log on as a TSO/E user and define additional directories, as described in Creating Additional Directories.
_______________________________________________________________

The following example creates an SMS-managed HFS data set:

//FSJOB   JOB
   //STEP1   EXEC PGM=IEFBR14
   //MKFS1   DD   DSNAME=FILE.SYSTEM.FS0001,DISP=(NEW,KEEP),
   //             DSNTYPE=HFS,SPACE=(CYL,(100,100,1)),DATACLAS=FILESYS,
   //             MGMTCLAS=NEVER,STORCLAS=SECURE

The following example creates a non-SMS-managed HFS data set:

//FSJOB   JOB
   //STEP1   EXEC PGM=IEFBR14
   //MKFS1   DD   DSNAME=FILE.SYSTEM.FS0001,DISP=(NEW,CATLG),
   //             DSNTYPE=HFS,SPACE=(CYL,(100,100,1)),DATACLAS=FILESYS,
   //             MGMTCLAS=NEVER,VOL=SER=XXXXXX,UNIT=SYSDA

The hierarchical file system can use first-in-first-out (FIFO) special files. To allocate a FIFO special file in a z/OS UNIX file system, specify PIPE in the DSNTYPE parameter and a path name in the PATH parameter.

Requirement: RACF or an equivalent security product must be installed and active on your system to use z/OS UNIX data sets. You cannot use a UNIX data set until someone with appropriate RACF authority uses the TSO MOUNT command to allocate DASD space and logically mount the file system.