I was unaware of both DCOLLECT as well as the compression related fields on the LISTCAT output. Thanks much to Mike and Kolusu. We can use the LISTCAT info immediately and the DCOLLECT down the road apiece. Appreciate your timely help!
Mike -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Mike Schwab Sent: Tuesday, November 5, 2019 11:20 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: calculating data set size - compression concern Caution! This message was sent from outside your organization. https://www.ibm.com/support/knowledgecenter/en/SSLTBW_2.3.0/com.ibm.zos.v2r3.idai200/recstr.htm IDCAMS DCOLLECT RECORD TYPE D 264(X'108') CHARACTER 8 DCDUDSIZ USER DATA SIZE (64 BIT UNSIGNED BINARY NUMBER) 272(X'110') CHARACTER 8 DCDCUDSZ COMPRESSED DATA SET SIZE (64 BIT UNSIGNED BINARY NUMBER) 280(X'118') BITSTRING 1... .... 2 DCDEXFLG DCDBDSZ COMPRESSION FLAGS (Not used for zEDC) DATA SIZES THAT ARE NOT VALID RECORD TYPE M 72 (48) SIGNED 4 UMDSIZE MIGRATION COPY DATA SET SIZE IN KILOBYTES/MEGABYTES 196 (C4) SIGNED 4 UMRECSP RECALL SPACE ESTIMATE IN KILOBYTES On Tue, Nov 5, 2019 at 8:55 PM Michael Hochee <mike.hoc...@aspg.com> wrote: > > A couple months ago I was in the process of retrieving the size of a > data set on disk until I came across a flag in one or more DSCBs that > indicate whether or not the data set is compressed. This was the > point at which I stopped coding, concluding that it was probably not > possible to come up with an accurate uncompressed size if the data set > resided on a SAN with compression turned on. Is my thinking off-base > here? (of course, I have no interest in reading the file to determine > the actual uncompressed length) > > Thanks, Mike > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, send > email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN -- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- 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
