For fun I created some files. It seems that files with LRECL=7000 through 10796 create a SDB BLKSZ equal to the LRECL, rather than half track blocking. There are many other LRECLs that also create SDB BLKSZ that seems less than optimal. Does anyone know why this might be? For instance LRECL 3681 and 6135 both create a BLKSZ of 18405 when I expected 25767 and 24540, respectively.
This seems quite peculiar, unless there is another "target" size other than 27998 used in certain cases. What do you think? On Fri, Jan 13, 2017 at 8:04 PM, retired mainframer < [email protected]> wrote: > 7000 > > > -----Original Message----- > > From: IBM Mainframe Discussion List [mailto:[email protected]] On > > Behalf Of Paul Gilmartin > > Sent: Friday, January 13, 2017 9:40 AM > > To: [email protected] > > Subject: Friday SDB puzzle > > > > Assuming 3390 track geometry. > > > > If a programmer codes RECFM=FB,BLKSIZE=0,LRECL=? > > > > For what value of LRECL does SDB select the smallest BLKSIZE? > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > -- Thank you and best regards, *Billy Ashton* ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
