As soon as you start production at the DR site, you need to start replication to your next site (production or third site). If you have a clean shutdown and the mirroring software supports it, you might be able to swap primary and secondary to avoid having to copy the volumes.
On Mon, Feb 11, 2019 at 9:06 PM Jesse 1 Robinson <[email protected]> wrote: > > Sorry Mike. That's what management seems to believe. It's what we've done for > TWENTY years. It allows us to fail over to the 'DR site' at will. Including > for-real failover where DR becomes the day-to-day home from then on. That's > not the hard part. The hard part is that after failover, production now lives > at the DR site, yet it's officially temporary. All new REAL customer data now > lives over the hill and through the woods, not at home. > > -- 1000's of volumes/UCBs worth of data that is suddenly obsolete 'at home' > and therefore useless. > > -- A GDPS mapping of all prod volumes to DR secondary volumes. > > -- A GDPS mapping of all secondary volumes to tertiary volumes, which we > actually IPL from. If we IPL'ed and ran with secondary volumes, mirroring > would be destroyed until we resynched. > > -- We're under the gun to move back 'home' with some alacrity because two > CECs are required for CF redundancy. DR has only one CEC for economy. > > All of this bodes ill for willy-nilly switching back and forth between data > centers unless there's some secret trick(s) I don't know about. > > . > . > J.O.Skip Robinson > Southern California Edison Company > Electric Dragon Team Paddler > SHARE MVS Program Co-Manager > 323-715-0595 Mobile > 626-543-6132 Office ⇐=== NEW > [email protected] > > > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[email protected]] On > Behalf Of Mike Schwab > Sent: Monday, February 11, 2019 5:03 PM > To: [email protected] > Subject: (External):Re: Wells Fargo? Well f*&%#d at the moment: Data center > up in smoke, bank website, app down . The Register > > Mirroring the DASD to the backup site. > > On Mon, Feb 11, 2019 at 4:50 PM Jesse 1 Robinson <[email protected]> > wrote: > > > > I have nothing but admiration for a shop that can slosh workload back and > > forth between two data centers. There are those that can and those (like > > us) that cannot. How does one get from the first group into the second? > > > > . > > . > > J.O.Skip Robinson > > Southern California Edison Company > > Electric Dragon Team Paddler > > SHARE MVS Program Co-Manager > > 323-715-0595 Mobile > > 626-543-6132 Office ⇐=== NEW > > [email protected] > > > > -----Original Message----- > > From: IBM Mainframe Discussion List [mailto:[email protected]] > > On Behalf Of Vernooij, Kees (ITOP NM) - KLM > > Sent: Monday, February 11, 2019 5:58 AM > > To: [email protected] > > Subject: (External):Re: Wells Fargo? Well f*&%#d at the moment: Data > > center up in smoke, bank website, app down . The Register > > > > We run in 2 sites continuously. Mainly Prod in 1 site and Dev/Acc in the > > other site, a CF in both sites and Dasd mirrored between the sites. > > Our DRP consists of moving workload from 1 site's LPARs to the > > corresponding LPARs in the other site and adding capacity b.m.o. CBUs. No > > manipulation of LPARs. > > We do this from time to time, sometimes as part of a DRP test, recently > > also because of a potentially disastrous power maintenance in a site. > > A piece of cake, compared to the comments I read above. > > > > Kees. > > > > > > > -----Original Message----- > > > From: IBM Mainframe Discussion List > > > [mailto:[email protected]] On Behalf Of Allan Staller > > > Sent: 11 February, 2019 14:30 > > > To: [email protected] > > > Subject: Re: Wells Fargo? Well f*&%#d at the moment: Data center up > > > in smoke, bank website, app down . The Register > > > > > > I have heard of a company in the Far East the periodically (every 6 > > > mths., IIRC) flips from site A to site B (and back). > > > Aus(?) to Phillipines ?) and back. > > > > > > -----Original Message----- > > > From: IBM Mainframe Discussion List <[email protected]> On > > > Behalf Of Savor, Thomas (Alpharetta) > > > Sent: Friday, February 8, 2019 7:08 PM > > > To: [email protected] > > > Subject: Re: Wells Fargo? Well f*&%#d at the moment: Data center up > > > in smoke, bank website, app down . The Register > > > > > > >We've been doing DR mirroring for 20 years. It gets tested often. > > > >We've > > > moved production twice to another >data center using our procedures. > > > What we've never done is run production in another location > > > >temporarily. 'Temporary' means move it, run it until at least one > > > transaction is committed, then move it >*all* back. That is hugely > > > complex and costly. > > > > > > >A lot of management fantasizes about a big A-B switch that we throw > > > >one > > > way or the other. So wrong. > > > > > > About 5-6 years ago, I was working as a vendor (Daily Support) for > > > Credit Card Software for Halifax/Bank of Scotland. I believe the > > > first time I was given a "heads up" was when we were supporting 12 > > > Million Cardholders. The "Heads up" was that on Friday evening at > > > 6pm Main site was going to shut down and the whole weekend > > > PRODUCTION was going to run on DR site, then 6am Monday Morning, > > > Main site is to come back up and continue as if nothing happened !!! I > > > literally peed in my pants !!! > > > Probably everyone in Atlanta could hear me...NOOOOOOOOO !!! > > > Thinking of all the network signons with Visa and Mastercard...all > > > the credit card Authorizations...there was absolutely zero chance of > > > this working without issues. > > > > > > Well, came in Monday morning after receiving no calls over the > > > week-end ....everything was fine. We ran the Batch Monday > > > night...and that would be pulling in transactions from over the week-end > > > from DR site. > > > NO ISSUES !!! Everything was fine. > > > > > > Whoever did this, from a Systems perspective....I tip my hat. I've > > > never seen someone do this with Production, but it worked fine...so > > > what do I know. Never seen anyone else do this in my 42 years of > > > Mainframing either. > > > > > > Unfortunately, Halifax/Bank of Scotland is no longer with us. They > > > were absorbed by Lloyds Banking Group. > > > > > > > > > Thanks, > > > Tom Savor > > > ---------------------------------------------------------------------- > 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
