Was that OS/360 R14? Symbols in sysin data streams, of course, is another and much later story.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on behalf of Steve Horein [steve.hor...@gmail.com] Sent: Tuesday, May 18, 2021 8:34 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Best catch up resources for MVS / ZOS Technologies I would argue JCL got better when symbols were allowed! :-) https://www.ibm.com/docs/en/zos/2.4.0?topic=es-symlist-parameter On Mon, May 17, 2021 at 10:46 PM Charles Mills <charl...@mcn.org> wrote: > Steve, let me wade in here and suggest some big picture. I think SHARE and > such is great for the details. > > What has changed since 2001? An idiosyncratic, IMHO list: > > - In 2001 SNA was yielding to TCP/IP. That transition has continued. An > awful lot of mainframe connectivity is now TCP/IP. Lots and lots of > Internet connectivity to the mainframe. > - Security is huge. Encryption is hot. Zero Trust is the buzzword of the > month. > - Everything is of course bigger. Z hardware goes up to what? 4TB real? > Someone will correct me if that is wrong. > - Tape drives have pretty much gone away. They live on as virtual, > emulated-on-DASD tape drives. > - The Cloud. Read any airline magazine for the latest. > - Remember VM? It was pretty moribund in 2001. It has found new life > hosting thousands of Linux instances. Yes, Linux running like a champ on Z > hardware. Mainframe Linux is huge. You can run Linux in a region of MVS in > a "container." > - Speaking of which, there is a Z box that will not IPL z/OS! It is called > Linux One. It's a mainframe with a bit hobbled somewhere such that > mainframe operating systems will not IPL, only Linux. > - Lots of new features in core MVS but you would fully recognize the > environment. If you sit down at a TSO/ISPF session it will seem like > nothing has changed. JCL has not gotten any better (or any worse, > thankfully). > - Remember the issue of "above the (24-bit) line"? It is still there, but > pretty much in the background. The new thing is data and execution "above > the (2GB/31-bit) bar." Lots of software products are exploiting data above > 2GB, and code can even run there, with lots of limitations. AMODE/RMODE 64. > - IBM JES3 is dead. Long live Phoenix JES3 plus. IBM ditched JES3, and > Phoenix picked it up. > - More emphasis on high level languages. Hardware design is being driven > by the Java folks and the compiler folks. Lots of new hardware > instructions. Hardware cycle times are not getting any faster, but > instructions do more per cycle. Caching getting more sophisticated and more > critical. The concept of "how long does an LR take" has totally > disappeared. It is a question with no answer other than "it depends." > > Anyone else want to weigh in? > > Charles > > > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On > Behalf Of Gibney, Dave > Sent: Monday, May 17, 2021 6:58 PM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: Re: Best catch up resources for MVS / ZOS Technologies > > I would suggest SHARE presentations and perhaps Marna Walle's migration > guides > > > -----Original Message----- > > From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On > > Behalf Of Steve Estle > > Sent: Monday, May 17, 2021 6:42 PM > > To: IBM-MAIN@LISTSERV.UA.EDU > > Subject: Best catch up resources for MVS / ZOS Technologies > > > > Hello Everyone in Mainframe Land, > > > > I've been out of the mainframe world since about 2001, but spent the > prior > > 20 years immersed in that world working with everything from MVS/370 to > > MVS/ESA and VM, performance and capacity planning disciplines across a > > variety of situations in the IT Services and consulting spaces. I, am, > now as a > > "IT Infrastructure Engineer- IBM z/OS Mainframe Engineer" after nearly 20 > > years of other activities (Project Mgmt, entrepreneur, etc) am about to > > potentially come back into a new mainframe role and I need to catch up as > > quickly as possible. Any suggestions on ways to fill in the gaps for > ZOS, ZVM, > > hardware, performance, etc? Bottom line I'm looking for that gap > education > > to as quickly as possible get up to speed with changes in platforms > since 2001. > > If prefer to call - all my info is below. > > > > Thanks, > > Steve Estle > > 303-604-0925 > > sest...@gmail.com > > > > ---------------------------------------------------------------------- > > 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 > > ---------------------------------------------------------------------- > 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 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
