Ed, If you think the main issue is distance then you seem to have missed the point. This is "In System Replication," meaning the source and the target are managed by the same Storage Control Unit.
If you are running XRC or TrueCopy then you send commands to the Remote Storage Controller to make an "In System Copy" of the Remote Copy target. The only additional traffic across that distance is the commands to tell the Remote CU to refresh and split the Shadowimage. Dual Copy - there's a blast from the past. I agree that you could think of this as Dual Copy on steroids, even though Dual Copy was more of a weak attempt at RAID-1. Ron > > I am, most concerned with the "copy that is perhaps miles (up to > 1000's). Where I last worked (IIRC) we had approximately 160 > volumes that were XRC'd that went from Chicago to Colorado then back > to NY. The (only other) copy being in Poughkeepsie. This is old > information so it might have changed from then. > > To me, the information that was bounced around the US was so out of > date it seemed like a waste of effort to do so. I know that XRC and > "dual copy" which (to me) is what you are talking about are similar. > I think the main issue is "distance, IIANM. > > > Ed > > ---------------------------------------------------------------------- > 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 ---------------------------------------------------------------------- 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
