There's a description of track capacity calculations in one of the DFSMS manuals; there are all sorts of overhead factors that have to be taken into account.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on behalf of Oscar [os...@naiandei.net] Sent: Monday, October 25, 2021 10:44 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: VSAM: Why a CISIZE of 4KB has 12 phyrecs/Track, not 13? Hi there, There's something I'm being missing, but acording to my numbers, there should be 13, not 12: Bytes per track: 56,664 bytes Bytes accessible per track: 55,996 bytes CI size: 4096 Physical record size: 4096 bytes Physical records per track (Bytes accessible per track / physical record size): 55,996 / 4096 = 13.6708984375 = 13???? What I'm missing? Thanks! -- Oscar ---------------------------------------------------------------------- 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
