And you can also write one record per track that is as long as the whole track (ca. 56K bytes) if you use EXCP, XDAP (these first two can run unauthorized), EXCPVR, or STARTIO (these last two must run authorized). But then the externally visible metadata - BLKSIZE, LRECL, etc. - may not be automatically recorded by these access methods. And SMF data might not be automatically recorded either, depending on the specific low-level access method used, whether the program is authorized or not, etc.
Bill Fairchild Software Developer Rocket Software 275 Grove Street * Newton, MA 02466-2272 * USA Tel: +1.617.614.4503 * Mobile: +1.508.341.1715 Email: bi...@mainstar.com Web: www.rocketsoftware.com -----Original Message----- From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On Behalf Of Thompson, Steve Sent: Sunday, May 02, 2010 4:04 PM To: IBM-MAIN@bama.ua.edu Subject: Re: Calculate Tape Bytes to Tracks -----Original Message----- From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On Behalf Of Ted MacNEIL Sent: Sunday, May 02, 2010 4:00 PM To: IBM-MAIN@bama.ua.edu Subject: Re: Calculate Tape Bytes to Tracks >someone will correct me if I am incorrect - but i believe that the maximum blocksize on DASD (3390-compatible) to assure 2 blocks per track is 27998 That is correct. But, that is not the statement I was responding to. IBM allows you to shoot yourself in the foot, and you can specify a blocksize greater than 27998. BTW, you can specify greater than 32760. I specify 32767 with SMF data all the time on disk. <SNIP> Since you bring it up indirectly, shouldn't LBI allow for full track writes? Regards, Steve Thompson ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
