The following message is a courtesy copy of an article that has been posted to bit.listserv.ibm-main,alt.folklore.computers as well.
[email protected] (Paul Gilmartin) writes: > I often wonder whether a reason TCP/IP triumphed over SNA was > that SNA didn't provide a facility with the scalability of DNS. re: http://www.garlic.com/~lynn/2009q.html#82 in some ways ... SNA is even less general than the arpanet implementation prior to the cut-over to internetworking on 1/1/83 ... which DNS is one part of. misc. trivia ... the person responsible for DNS had earlier spent some time at the science center ... some science center posts http://www.garlic.com/~lynn/subtopic.html#545tech when the person was student at mit. tcp/ip was the technology basis for the modern internet ... nsfnet backbone was the operational basis for the modern internet and cix was the business basis for the modern internet. misc. old email related to nsfnet backbone: http://www.garlic.com/~lynn/lhwemail.html#nsfnet one of the things that the internal networking technology did was a kind of gateway facility in every node ... somethat that was also was a feature of internetworking. misc. past posts mentioning internal network http://www.garlic.com/~lynn/subnetwork.html#internalnet JES2 had other significant issues ... having muddled what was job control and what was networking. as a result ... JES2 systems at different levels and with incompatible headers ... could crash each other ... and bring down the whole system (there was infamous case of some internal jes2 systems in san jose which were bringing down hursley mvs systems). the major internal networking technology was able to have "native" drivers ... but also install "jes2" drivers for communicating with jes2 systems (and allow jes2/mvs systems to participate in the internal network). this feature evolved into these (non-native) jes2 drives adding features to try and rewrite jes2 headers to that they were always compatible with the direclty connected jes2/mvs systems (as countermeasure to have high frequency of jes2/mvs crashing all over the world). the internal technology got blaimed for not preventing the hursley mvs systems from crashing (since the internet network technology hadn't been upgraded to filter some of the new san jose jes2 fields ... from reaching the hursley jes2 systems). misc. past posts mentioning hasp, jes2, and/or jes2 networking http://www.garlic.com/~lynn/submain.html#hasp dislcaimer: my wife did a stint in the jes group (among other things acted as one of the catchers for asp->jes3 ... and did a design document for merged jes2/jes3 product) ... before getting con'ed into going to pok to be in charge of loosely-coupled architecture. my wife was also co-author of internal architecture document (AWP39) in the early days of SNA called peer-to-peer networking (which SNA group possible viewed as competition to their master/terminal-control architecture). she also had numerous battles in POK with the SNA organization over not using SNA for her "peer-coupled shared data architecture" (which, except for ims hot-standby, saw very little uptake until sysplex) ... some past references: http://www.garlic.com/~lynn/submain.html#shareddata there were temporary truces with the SNA organization over her not having to use SNA within the walls/boundaries of the datacenter ... but SNA had to be used if something involved crossing the datacenter walls. later i would needle the person responsible for APPN (AWP164) to stop trying to prop up SNA (they weren't going to appreciate it) and come work on real networking ... if fact, the SNA organization non-concurred with announcing APPN ... and it was held up for several weeks while the announcement letter was careful to not even imply that there was any connection between APPN and SNA. misc. past posts mentioning AWP39, AWP164 &/or AAPN http://www.garlic.com/~lynn/2004n.html#38 RS/6000 in Sysplex Environment http://www.garlic.com/~lynn/2004p.html#31 IBM 3705 and UC.5 http://www.garlic.com/~lynn/2005p.html#8 EBCDIC to 6-bit and back http://www.garlic.com/~lynn/2005p.html#15 DUMP Datasets and SMS http://www.garlic.com/~lynn/2005p.html#17 DUMP Datasets and SMS http://www.garlic.com/~lynn/2005q.html#27 What ever happened to Tandem and NonStop OS ? http://www.garlic.com/~lynn/2005u.html#23 Channel Distances http://www.garlic.com/~lynn/2006h.html#52 Need Help defining an AS400 with an IP address to the mainframe http://www.garlic.com/~lynn/2006j.html#31 virtual memory http://www.garlic.com/~lynn/2006k.html#9 Arpa address http://www.garlic.com/~lynn/2006k.html#21 Sending CONSOLE/SYSLOG To Off-Mainframe Server http://www.garlic.com/~lynn/2006l.html#4 Google Architecture http://www.garlic.com/~lynn/2006l.html#45 Mainframe Linux Mythbusting (Was: Using Java in batch on z/OS?) http://www.garlic.com/~lynn/2006o.html#62 Greatest Software, System R http://www.garlic.com/~lynn/2006r.html#4 Was FORTRAN buggy? http://www.garlic.com/~lynn/2006r.html#9 Was FORTRAN buggy? http://www.garlic.com/~lynn/2006t.html#36 The Future of CPUs: What's After Multi-Core? http://www.garlic.com/~lynn/2006u.html#28 Assembler question http://www.garlic.com/~lynn/2006u.html#55 What's a mainframe? http://www.garlic.com/~lynn/2007b.html#9 Mainframe vs. "Server" (Was Just another example of mainframe http://www.garlic.com/~lynn/2007b.html#48 6400 impact printer http://www.garlic.com/~lynn/2007b.html#49 6400 impact printer http://www.garlic.com/~lynn/2007d.html#55 Is computer history taugh now? http://www.garlic.com/~lynn/2007h.html#35 sizeof() was: The Perfect Computer - 36 bits? http://www.garlic.com/~lynn/2007h.html#39 sizeof() was: The Perfect Computer - 36 bits? http://www.garlic.com/~lynn/2007l.html#62 Friday musings on the future of 3270 applications http://www.garlic.com/~lynn/2007o.html#72 FICON tape drive? http://www.garlic.com/~lynn/2007p.html#12 JES2 or JES3, Which one is older? http://www.garlic.com/~lynn/2007p.html#23 Newsweek article--baby boomers and computers http://www.garlic.com/~lynn/2007q.html#46 Are there tasks that don't play by WLM's rules http://www.garlic.com/~lynn/2007r.html#10 IBM System/3 & 3277-1 http://www.garlic.com/~lynn/2007v.html#53 folklore indeed http://www.garlic.com/~lynn/2008b.html#42 windows time service http://www.garlic.com/~lynn/2008d.html#71 Interesting ibm about the myths of the Mainframe http://www.garlic.com/~lynn/2008e.html#73 Convergent Technologies vs Sun http://www.garlic.com/~lynn/2008i.html#97 We're losing the battle http://www.garlic.com/~lynn/2009e.html#56 When did "client server" become part of the language? http://www.garlic.com/~lynn/2009i.html#26 Why are z/OS people reluctant to use z/OS UNIX? http://www.garlic.com/~lynn/2009l.html#3 VTAM security issue http://www.garlic.com/~lynn/2009l.html#7 VTAM security issue -- 40+yrs virtualization experience (since Jan68), online at home since Mar1970 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
