Sorry, but “several models of 3380”? If 3380k held almost 2GB per module and you saved one byte per record, then you saved the one byte over 2 billion records to save just one 3380K’s worth of data. Forgive me for being skeptical
Get Outlook for iOS On Wed, Apr 22, 2020 at 12:34 PM -0700, "Pommier, Rex" <rpomm...@sfgmembers.com> wrote: Sorry, we'll have to agree to disagree. It wasn't mythology at my places of business. When I was in application development, disk and other resource efficiency was of paramount concern and when I moved into systems programming I got to be the one going to the developers and making sure they didn't use bad blocking. Rex -----Original Message----- From: IBM Mainframe Discussion List On Behalf Of Gerhard adam Sent: Wednesday, April 22, 2020 2:20 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: [External] Re: Here we go again; ... and so goes the mythology. The truth is that programmers routinely used lousy block sizes and wastes tremendous amounts of space. JCL sizes were rarely scrutinized nor was data set usage. It was entirely possible for test data to exist for weeks or months beyond its usefulness This isn’t to say that money was obviousness spent and even wasted, but few installations took managing their DASD seriously. They would worry about saving a byte by packing a date while wasting 100 tracks due to poor blocking. This is why nothing really happened until System Determined Blocksize, and the Storage Administrator tools became available. People certainly wrung their hands but rarely did anything about it Get Outlook for iOS On Wed, Apr 22, 2020 at 12:08 PM -0700, "Pommier, Rex" wrote: Agreed. Another thing to remember was that we were dealing with disk volumes measured in kilobytes or megabytes instead of terabytes. In addition, the site I cut my teeth on had all removable disk packs that got rotated onto the drives for processing of each application. Every byte saved per record gave us the better chance of fitting the entire set of datasets on a single disk set so we could process it. Rex -----Original Message----- From: IBM Mainframe Discussion List On Behalf Of Charles Mills Sent: Wednesday, April 22, 2020 12:32 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: [External] Re: Here we go again; Faulty logic there. A byte here and byte there and pretty soon you have to buy ANOTHER unit of DASD. It costs the same empty or full, but if it gets nearly full you have to pay for another. Charles -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Gerhard adam Sent: Wednesday, April 22, 2020 10:06 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Here we go again; The notion of “savings” was marketing nonsense. The DASD was paid for regardless of whether it held a production database or someone’s golf handicap. It cost the same whether it was empty or full. 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