Allocating the VSAM Data Set as a Dump Directory

You must allocate a dump directory for each IPCS session. IPCSDDIR is the standard ddname for the IPCS dump directory. IPCS has provisions to ensure the data set's integrity.

If you do not want to let the TSO/E IPCS command allocate the dump directory, you must allocate a dump directory before entering IPCS. The TSO/E ALLOCATE command allocates the data set userid.DDIR to the ddname IPCSDDIR:

ALLOCATE DDNAME(IPCSDDIR) DSNAME('userid.DDIR') SHR

When you start an IPCS session, IPCS opens the data set allocated to IPCSDDIR. If you did not allocate the data set — whether by entering the ALLOCATE command or by using a CLIST — or if IPCS cannot open it, the TSO/E IPCS command ends.

Do not allocate IPCSDDIR to the batch local shared resources (LSR) subsystem. IPCSDDIR must be allocated to a data set.