Re: Newbie question on table design.

Anne & Lynn Wheeler <lynn_at_garlic.com> writes:
> one of the things that started to show up with interactive computing
> was games. in the 70s, tymshare had ported the adventure dec fortran
> source to vm/cms and i obtained a copy for internal corporate
> distribution. at one point, the executives in STL complained that they
> thot nearly everybody was spending their days playing adventure on
> vm/cms (instead of doing dbms development). recent post mentioning
> adventure:
> http://www.garlic.com/~lynn/2007g.html#0 10 worst PCs

re:
http://www.garlic.com/~lynn/2007j.html#17 Newbie question on table design

STL (south san jose, dbms and language development, subseqently renamed the silicon valley lab) and Hursley (UK, communication and cics development) looked at off-shift dataprocessing offloading in 1980. The dominant development platform at both locations was vm/cms interactive computing. like in the reference to palo alto vm/cms this sort of interactive workload tends to be running at full capacity during first shift with much lower off-shift use.
http://www.garlic.com/~lynn/2007j.html#13 Interrupts

the strategy was to get a "high-bandwidth" double-hop satellite link between STL and Hursley (i.e. from west coast up to the geo-sync satellite over the US, down to the east coast, up again to geo-sync satellite over the atlantic and down to Hursley). Since there was 8hr time-difference ... some of the 1st shift Hursley workload could be run on the STL machines (being 3rd shift in california) and some of the 1st shift STL workload could be run on Hursley machines (being 2nd shift in UK).

This was going to be showcase operation ... so some of the strategy people stepped in to "force" the link to operate with MVS JES2/SNA (even tho the dominate operation was vm/cms which didn't use SNA for network links).

They tried to bring up JES2/SNA on the link ... and nothing happened. Somebody then suggested to try it with VM link just to check things out ... and it came up with no errors. They immediately switched back to JES2/SNA on the link and nothing happened. The "official" conclusion was that there was significant transmission errors on the double-hop satellite link and VM link error handling was too primitive to recognize the problems. The actual situation was that the JES2/SNA had built in round-trip timeout ... which the round-trip double-hop satellite propogation delay was exceeding (and which they couldn't "fix") ... but the VM link support did adjust for the round-trip (double-hop satellite) propogation delay.

for other MVS JES2 topic drift between San Jose and Hursley ... old post mentioning (unless converted) network traffic between different versions of MVS JES2 (with incompatible network traffic headers) would result in JES2 failure that would also bring down the MVS system http://www.garlic.com/~lynn/2006x.html#8 vmshare

misc. other posts in this thread:

http://www.garlic.com/~lynn/2007j.html#2 Newbie question on table design
http://www.garlic.com/~lynn/2007j.html#7 Newbie question on table design
http://www.garlic.com/~lynn/2007j.html#8 Newbie question on table design
http://www.garlic.com/~lynn/2007j.html#9 Newbie question on table design
http://www.garlic.com/~lynn/2007j.html#11 Newbie question on table design
http://www.garlic.com/~lynn/2007j.html#12 Newbie question on table design
http://www.garlic.com/~lynn/2007j.html#14 Newbie question on table design
http://www.garlic.com/~lynn/2007j.html#16 Newbie question on table design
http://www.garlic.com/~lynn/2007j.html#24 Newbie question on table design

past posts mentioning the attempt at San Jose/Hursley off-shift offloading:

http://www.garlic.com/~lynn/99.html#212 GEOPLEX
http://www.garlic.com/~lynn/2002q.html#35 HASP:
http://www.garlic.com/~lynn/2003j.html#19 tcp time out for idle sessions
http://www.garlic.com/~lynn/2004k.html#19 FAST TCP makes dialup faster than broadband?
http://www.garlic.com/~lynn/2004o.html#60 JES2 NJE setup
http://www.garlic.com/~lynn/2004o.html#61 360 longevity, was RISCs too close to hardware?
http://www.garlic.com/~lynn/2006m.html#16 Why I use a Mac, anno 2006
http://www.garlic.com/~lynn/2006s.html#17 bandwidth of a swallow (was: Real core)