APPC/MVS requires that a VSAM KSDS data set be allocated for the side information data set. The APPC/MVS side information data set contains translations of symbolic destination names used by TPs when they issue outbound allocate requests.

Because DFM is a DDM target only and therefore does not issue outbound allocate requests, the side information data set does not need to contain any information. The name used for the SIDEINFO parameter in system PARMLIB member APPCPMxx must match the side information data set name.

Sample JCL for allocating the side information KSDS data set can be found in system SAMPLIB member ATBSIVSM (for example, SYS1.SAMPLIB(ATBSIVSM)). For information about creating side information, see z/OS MVS Planning: APPC/MVS Management.