https://www.ibm.com/it-infrastructure/z/technologies/gdps
https://www.infoworld.com/article/2614033/disaster-recovery/data-centers-under-water--what--me-worry-.html On Wed, Jan 3, 2018 at 12:18 AM, Alan(GMAIL)Watthey <[email protected]> wrote: > I have had a strange request from management as to how far apart we can move > our production systems. I know there are limitations on how far the (in > this case) two systems (and two coupling facilities) can be apart and I've > dug up an old IBM Redbook on the issue where they did tests with a sysplex > at 0, 20, 40, 60 and 80 kms apart. Physical limitations (eg. FICON) don't > seem to be an issue. We are a CICS and DB2 shop so the manual certainly > addressed issues that we might see but it is dated 2008 so has anything > changed since then? CICS and DB2 have moved on a long way in that time. > > > > I was thinking of saying up to 10km but this is really a finger in the air > value. Maybe it's only 5 and maybe its 20 or 30. Can we just throw CPU and > memory at it as I would think we would have a lot more transactions running > at the same time with some (but not all apparently) having extra delays > incurred? The transaction increases suggested in that manual are > milleseconds and these days (with all the distributed systems involved) the > users are happy to get 10 second response times. Admitted this can involve > many, many transactions behind the scenes from the application servers to > populate their crowded browser screens. Gone are the days of data-entry > pools and sub-second responses. > > > > What I was wondering is there anyone out there with real life experience on > this kind of activity. How far apart do people run their sysplex systems? > What gotchas sprang up to relieve them of their sanity? Any pointers would > be gratefully appreciated. > > > > Regards, > > Alan Watthey > > > > From: IBM Mainframe Discussion List [mailto:[email protected]] On > Behalf Of IBM-MAIN automatic digest system > Sent: 03 January 2018 8:00 am > To: [email protected] > Subject: IBM-MAIN Digest - 1 Jan 2018 to 2 Jan 2018 (#2018-2) > > > > > > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN -- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
