The "DARK SIDE" was not in reference to TCP/IP. As far as TCP over SNA, we can easily list as negative TCP attributes (e.g. security and timeliness). Can you imagine what SNA would have been today had efforts remained with implementing the desirable TCP attributes into SNA.
Jon Perryman >________________________________ > From: Paul Gilmartin <[email protected]> >To: [email protected] >Sent: Saturday, November 9, 2013 10:12 AM >Subject: SNA vs TCP/IP (was: z/OS is antique ...) > > >On Tue, 5 Nov 2013 11:49:40 -0800, Jon Perryman wrote: > >>... sad that he's bringing others to the dark side. >> ... >>* z/OS: SNA existed long before TCP/IP was available. SNA was a robust, >>reliable and secure communications methodology. Once TCP was became >>available, we had the same situation as Betamax versus VHS. TCP won. >> >There's always a reason. Rarely is it an analogue of Gresham's Law, >to which one partisan attributed the triumph of UNIX over VMS ("Bad >software drives out good!") Betamax succumbed to the greater capacity >of VHS cartridges; a decisive advantage in the eyes of consumers at a >tipping point in time despite the higher quality of Beta in professionals' >view. For many years thereafter I saw Beta only in the kits of TV news >reporters on location. I think VHS had caught up in quality and Beta >in capacity, but both camps has too much capital investment to switch. > >So, why TCP/IP over SNA? > >o Price? > >o Openness of standards and implementations (price, again)? > >o Institutional bias against a perceived single-vendor solution > (openness, again)? > >o Structured name space (thereby larger and more easily > partitioned/distributed)? > >o DNS (name space, again)? > >Imagine an alterate universe without TCP/IP but an Internet >very simlar to ours; Google; Facebook; Skype; iTunes; >NetFlix; and all; all running (FSVO) smoothly on SNA. What >modifications or extensions had to be made to SNA to >accommodate this? > >-- gil > >---------------------------------------------------------------------- >For IBM-MAIN subscribe / signoff / archive access instructions, >send email to [email protected] with the message: INFO IBM-MAIN > > > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
