The SPACE parameter is used to allocate space for datasets.

We can allocate space in Cylinders/Tracks/Blocks

Syntax -> SPACE=(CYL,(primary,secondary,directory),RLSE,CONTIG,MXIG,ROUND)

Instead of CYL, We can use TRK or BLK

Meaning of Sub Parameter

TRK - Requesting space in track

CYL - Requesting space in cylinders

PRIMARY - Primary storage to be allocated at the time of data set created

SECONDARY - Additional storage to be allocated, If primary storage is not
sufficient

DIRECTORY - Space for recording of name and location of partitioned data sets

RLSE - Request for release of space previously allocated unused space after
completion of job

CONTIG - Request for contiguous space

MXIG - Request for large aread of contiguous space

ROUND - Request for entire cylinder for storage of data set

EXAMPLE JCL -> //MYJOB JOB (W345),'KRISHNA REDDY'

//STEP1 EXEC PGM=COBPROG

//INFILE DD DSN=TEST.GLOB.LIB

// UNIT=4560

// SPACE=(CYL,(30,4))

In this example, 30 cylinders are requested as primary space and 4 additional
cylinders as secondary space.