I think SDB is automatic these days, and not just for SMS data sets. Any data set will get SDB if BLKSIZE is zero or omitted.
One note, however. Just changing the DCB characteristics of the data set will not fix the problem. Existing data already contained in the allocation will still be FA unblocked. It needs to get rewritten to acquire the specified physical attributes. A smallish data set could be edited and 'saved'. A large data set could be copied to another followed by renames. Even appending new data (DISP=MOD) will not fix the old records. . . JO.Skip Robinson SCE Infrastructure Technology Services Electric Dragon Team Paddler SHARE MVS Program Co-Manager 626-302-7535 Office 323-715-0595 Mobile jo.skip.robin...@sce.com From: Mark Zelden <m...@mzelden.com> To: IBM-MAIN@bama.ua.edu Date: 05/04/2012 01:55 PM Subject: Re: Old timer question Sent by: IBM Mainframe Discussion List <IBM-MAIN@bama.ua.edu> On Fri, 4 May 2012 13:48:16 -0700, Lizette Koehler <stars...@mindspring.com> wrote: >If it is setup in your shop, set blksize to 0 and let the system determine block size figure it out. > >Lizette > Is there a way to not have it set up? I do remember an MVS system long ago in a galaxy far far away where there was a JES2 exit that changed the internal text from your JCL to have half track blocking for DASD. But BLKSIZE=0 has worked since... well, for so long I don't even remember. MVS/XA? Or was it DFSMS V1 with MVS/ESA or MVS/XA 2.2.3? Mark -- Mark Zelden - Zelden Consulting Services - z/OS, OS/390 and MVS mailto:m...@mzelden.com Mark's MVS Utilities: http://www.mzelden.com/mvsutil.html Systems Programming expert at http://expertanswercenter.techtarget.com/ ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: INFO IBM-MAIN
