Using allocation attributes for print partitioned data sets

Although you can use PDS or PDSE organization, using PDSE (DSNTYPE=LIBRARY) provides for best performance and avoids any fragmentation of the PDS space.

Use the FREE command after termination of any IPCS subcommand to free the allocated partitioned data set, for example:

FREE DDNAME(IPCSPDS)

Table 1 shows the attributes to use when allocating a partitioned data set for routing IPCS messages.

Table 1. Allocation attributes for print partitioned data sets
Attribute	Print partitioned data set
DDNAME or FILE	IPCSPDS
DISP	NEW, SHR or OLD
DSORG	PO
DSNTYPE	LIBRARY or no
RECFM	VBA
LRECL	Minimum value: 83 Maximum value: 255 Default value: the value specified in session parameters or 137 For the PDS, if LRECL does not satisfy the minimum and maximum conditions, IPCS cancels the PDS option.
BLKSIZE	Must be greater than or equal to LRECL + 4 If you specify none, IPCS uses 4 + (4 * LRECL) as BLKSIZE For the PDS, if you specify a BLKSIZE less than LRECL + 4, IPCS cancels the PDS option.
SPACE	You determine the space for the partitioned data sets.