I believe that 3120 is one of the optimal block sizes for 80 byte records on 3330. At 3120 you get four blocks/track, at 3200 you get only three.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on behalf of Paul Gilmartin [0000000433f07816-dmarc-requ...@listserv.ua.edu] Sent: Wednesday, January 20, 2021 11:25 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: TSO RECEIVE and System Determined Blksize (was: TSO XMIT and no member list) On Wed, 20 Jan 2021 10:03:01 -0600, Wendell Lovewell wrote: > >Could you please elaborate on your comment "never solved issue like non-SDB >(system determined blocksize) in XMIT and RECEIVE command"? > Long ago there were discussions here of ISPF SUBMIT's failing because of inadequate (default?) SPACE for its workfiles. The same might apply to TRANSMIT. Likewise old utilities might have hardcoded BLKSIZE (3120? 6144?) suboptimal for recent DASD. But if such utilities were changed to BLKSIZE=0 the larger values supplied by SDB might cause downstream programs to fail. Formerly some utilities (Linkage Editor?) imposed a limit of 3120. I had some Rexx programs fail when EXECIO removed its internal BLKSIZE computation to let SDB operate. Rapidly fixed by APAR, but Support advised "Always code BLKSIZE." An ironic consequence of SDB. >I have been having an issue with TSO RECEIVE (and a program that also calls >IEBCOPY) when SDB is "Y". IEBCOPY is having some sort of problem and >displaying this message: > >IEB1139W THE OUTPUT DATA SET BLOCK SIZE IS BEING REDUCED FROM 32720 TO 27920 >BYTES. ANY EXISTING PHYSICAL RECORDS > LONGER THAN 27920 BYTES ARE FAT BLOCKS AND MAY CAUSE I/O ERRORS. > >and ending with a return code of 4. The dataset being RECEIVEd is actually >fine, as the LRECL is always less than 27920 (80 in this case). But RECEIVE >sees the RC=4 from IEBCOPY and ends with RC=12. > >IBM currently has case number TS004689510 open for this, but I assumed it was >a new issue although I only have SDB=Y on right now for testing. -- gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
