Hi Peter, I came across a similar use case a couple times over the past year or so. Shifting priorities have prevented me from doing much with it, but while at the most recent SHARE in Fort Worth, I asked one of the DFSMS architects about it. She encouraged me to check out the CSI, specifically, fields UDATASIZ and COMUDSIZ. They appeared to satisfy my use case, although as others have mentioned there are a few restrictions especially for UDATASIZ.
HTH, Mike -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Farley, Peter x23353 Sent: Thursday, May 14, 2020 11:55 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Is there any z/OS API to get byte file size for non-VSAM, non-zFS, non-database files? Caution! This message was sent from outside your organization. This question came to me from a co-worker: Is there any API to get the byte file size of a non-VSAM, non-zFS, non-database file in z/OS? I.E., byte file size for plain sequential files? I am aware of the "old way" of reading the VTOC of a volume to get the various DSCB's that total up disk extents, but that gets complicated quickly for multi-volume files, and was never guaranteed to be accurate as to the actual byte count of data in the file except in the RECFM=FS/FBS case anyway. There is always the performance-killing option of just reading the whole file and totaling up the length of every record (or block depending on how you structure the reads), but no one would call that an API. As far as I know there is no such API in z/OS, and this is what I told my co-worker, but am I wrong? Is there an alternative of which I am not aware? TIA for your input. Peter -- This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system. ---------------------------------------------------------------------- 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
