On 03/04/07, Jerry Zhu <[EMAIL PROTECTED]> wrote: > > > > > > > --- Steve Jones <[EMAIL PROTECTED]> wrote: > > > For highly interactive systems (such as plant > > management) don't under > > estimate the cost of network latency. > > The bigger drivers against shared infrastructure > I've seen have been latency and reliability, sometimes > there really are reasons to put the tin next to the > users. > > > > Can't Network latency and reliability issues be > addressed comfortably with (asynchronous or > synchronous) reliable messaging and distributed event > driven ESB?
In simple terms... no. If you have a production line that is churning out 10,000 cans of beans an hour then you can't have it waiting for 2 seconds , or 2 hours in the case of network failure, for a response from a computer to say "make more of the ones with sausages" and setting up the production line accordingly. Now the link back to the ERP back probably handle the tolerances and be at the other end of a messaging system or ESB, but the plant control system needs to work within tight bounds. I'm not sure how async and an ESB would address > > Jerry > > __________________________________________________________ > Expecting? Get great news right away with email Auto-Check. > Try the Yahoo! Mail Beta. > http://advision.webevents.yahoo.com/mailbeta/newmail_tools.html >
