Martin, The distance will have a large affect on your IO response time. Reads will have 1ms of round trip latency for every 100km, and writes will have 2ms of round trip latency for every 100km.
I'm not aware of any switch products that provide spoofing for FICON writes if you use a DWDM. If you want to use network Channel extension than YMMVAL - Your Mileage May Vary A Lot. Ron > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On Behalf Of > Martin Kline > Sent: Thursday, February 11, 2010 8:04 AM > To: IBM-MAIN@bama.ua.edu > Subject: [IBM-MAIN] GDPS Distance Impact on Sysplex Response Time > > We have a sysplex with four processors, two of which run production work > with development work on the others. In their quest for trivia, my > management wants to know the impact to production if we move the > development processors to a second site, leaving the coupling facilities, > DASD, > VTS and primary network all on one site. > > I suspect this is a function of how much production data is being touched by > the development systems as well as just the handshaking, messaging, etc. > across the entire sysplex. I also suspect it affects some online transactions > and batch work much more than other work. In addition, they want to know > how much greater the impact is if the other site is twice as far away. > > And, just to make this interesting, they want an answer tomorrow. Actually > they would like it yesterday, but tomorrow will have to do. I've been reading > several manuals, and I think the answer they should get is 42. > > Does anyone have any suggestions on where to concentrate my efforts (only > those that won't get me fired, please)? > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO > Search the archives at http://bama.ua.edu/archives/ibm-main.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
