I keep on seeing from AI 56,664 bytes per tack for 3390 pack how is that determined
Joe Reichman On Mon, Jun 29, 2026 at 8:58 PM Attila Fogarasi < [email protected]> wrote: > The net bytes (i.e. longest record you can write to that track) varies by > access method as there is overhead (control bytes). TRKCALC is provided to > compute the largest record which can fit on a track (using EXCP), see > > https://www.ibm.com/docs/en/zos/3.2.0?topic=instructions-performing-track-calculations-trkcalc-macro > > Unless you are using EXCP the hardware track capacity is irrelevant, the > access method used will determine the actual bytes per track (and varies by > BLKSIZE). > > On Tue, Jun 30, 2026 at 10:35 AM Joseph Reichman < > [email protected]> wrote: > > > Would anyone know how to get the net bytes per track for a 3390 > > > > I have been using devtype ddname,buffer,devtab > > > > > > Where buffer is a 32 byte output field > > > > But it keeps on coming back with the overhead of 58,864 > > > > I think the net is 56,664 > > > > I would like to get that figure programmatically instead of hard coding > it > > > > Thanks > > > > ---------------------------------------------------------------------- > > 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 > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
