Just tested this on my z/OS 3.1 system and I have differing results to you. Existing blksize was respected. Lennie
-----Original Message----- From: IBM Mainframe Discussion List <[email protected]> On Behalf Of Charles Mills Sent: 18 December 2025 17:53 To: [email protected] Subject: Grrr! Yes, TSO TRANSMIT destroys PDSes (Rant) There was some discussion here last week or so about the hard-coded BLKSIZE=3120 in TSO TRANSMIT. Someone IIRC expressed the hope that at least it respected existing data set BLKSIZEs. It does not! I just got bit! If you have a PDS with BLKSIZE > 3120 with existing members, and you use that data set and a member name for TSO TRANSMIT output, TRANSMIT clobbers the BLKSIZE to 3120 and your existing members become unreadable. Grrr! Thank you for your sympathy. Charles ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
