>From the Processing a Sequential Data Set chapter of my DFSMS Using Data Sets manual (admittedly z/OS 1.11):
"The number of data sets that you can concatenate with sequential concatenation is variable. It is governed by the maximum size of the TIOT option. The system programmer controls the TIOT size with the option ALLOCxx member of SYS1.PARMLIB. The smallest TIOT value allows 819 single-unit DD statements or 64 DD statements having the maximum number of units." (I could not find a reference that defines the term "unit." It is does not appear to be extents since 64 datasets with 15 extents each comes to 960 total extents.) >From the Processing a Partitioned Data Set (PDS) chapter of the same manual: "There is a limit to how many DD statements are allowed in a partitioned concatenation. Add together the number of PDS extents, the number of PDSEs, and the number of UNIX directories in the concatenation. The sum cannot exceed 255. For example, you can concatenate 15 PDSs of 16 extents each with 8 PDSEs and 7 UNIX directories ((15 x 16) + 8 + 7 = 255 extents)." (So each PDS extent counts as one while each PDSE and UNIX directory counts as only one regardless of the number of extents.) I would expect the current manuals to have similar details. > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On > Behalf Of Reichman Joseph > Sent: Monday, August 22, 2016 8:38 AM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: Limit on the number of concatenated datasets > > Hi > > I looked in the JCL reference and DFSMS bookshelf and did not see a limit on the number > of concatenated datasets > > > Would anybody know if there is one ? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
