That I don't know. I've only dealt with GSAM checkpoints (which may not support RECFM=VBS). And one other: checkpoints in z/OS FTP.
My *guess* is that since a checkpoint has to flush the buffers to disk before you fill up the block, even VBS would have a short block. -----Original Message----- From: IBM Mainframe Assembler List <ASSEMBLER-LIST@LISTSERV.UGA.EDU> On Behalf Of Paul Gilmartin Sent: Monday, November 13, 2023 12:50 PM To: ASSEMBLER-LIST@LISTSERV.UGA.EDU Subject: Re: Is True Skip-Sequential Processing Possible with RECFM=FB,DSORG=PS? On 11/13/23 08:23:44, Schmitt, Michael wrote: >>> As long no one ever uses DISP=MOD > > ...or checkpoints. Checkpoints can cause short blocks to be written. > > (My knowledge is with IMS/DB GSAM checkpoints.) How does checkpoint interact with RECFM=VBS? -- gil
