No thanks, I'll leave that sort of thing to you; you're much better at it than I am.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on behalf of R.S. [r.skoru...@bremultibank.com.pl] Sent: Wednesday, July 8, 2020 7:58 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Storage & tape question Feel free to answer off-topic, criticize unsaid sentences and be self-concvinced you are right while rest of the world is wrong. Have a fun. -- Radoslaw Skorupka Lodz, Poland W dniu 08.07.2020 o 13:53, Seymour J Metz pisze: > Whoosh! You're completely missing the point. It's a matter of basic > probability theory. Given N independent adverse scenarios with probabilities > Pn, the probability that none of them will happen is (1-P1)(1-P2)...(1-PN). > > But it's not my dog. Feel free to run without backups, as long as you don't > ask for sympathy when the balloon goes up. > > > -- > Shmuel (Seymour J.) Metz > http://mason.gmu.edu/~smetz3 > > ________________________________________ > From: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on behalf of > R.S. [r.skoru...@bremultibank.com.pl] > Sent: Wednesday, July 8, 2020 5:32 AM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: Re: Storage & tape question > > It has no value. > Terrorist attack is unlikely, but two terrorist attacks at the time are > more unlikely. Thousand terrorist attacks at the tima are even more > unlikely. > A bomb attack is unlikely. Large (atomic?) bomb attack is more unlikely. > When you have two datacenters and tapes in shelter off-site ...it is > still just unlikely to have coordinated attack on all the locations at > the time, and it is just unlikely to have shelters strong enough. > More data locations? Fine, more bombs. > And it is quite likely some malevolent people would know the adresses of > the locations. > > If you think you can protect your data against unlikely events > (disaster, etc.)... > Or rather: if you think you know how to do it, despite of the costs - > you're simply WRONG. > There is always some level of protection. The level is not infinite and > *cannot* be inifite. It can be high. Maybe "high enough" or "reasonably > high". > > > Side note: there are scenarios when achieving higher level of protection > is pointless. Let's assume ticket system for metro transportation > (buses) and ...war. Or ticket system for buses in Biloxi. > > -- > Radoslaw Skorupka > Lodz, Poland > > > > > > > W dniu 07.07.2020 o 17:27, Seymour J Metz pisze: >> A terrorist attack is unlikely. >> >> An earthquake is unlikely. >> >> A tornado is unlikely. >> >> A flood is unlikely. >> >> ... >> >> The more unlikely risks there are, the greater the odds that one of them >> will happen. If you don't have off site backups then your data are at risk, >> and when the balloon goes up it won't matter how unlikely the particular >> failure mode was. >> >> >> -- >> Shmuel (Seymour J.) Metz >> http://mason.gmu.edu/~smetz3 >> >> ________________________________________ >> From: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on behalf of >> R.S. [r.skoru...@bremultibank.com.pl] >> Sent: Tuesday, July 7, 2020 10:59 AM >> To: IBM-MAIN@LISTSERV.UA.EDU >> Subject: Re: Storage & tape question >> >> W dniu 07.07.2020 o 16:52, Edward Finnell pisze: >>> 1200lbs Semtex make you realize what backups are for and where is your cold >>> site? >>> >>> In a message dated 7/7/2020 9:37:20 AM Central Standard Time, >>> rwjack...@firsthorizon.com writes: >>> R.S. is spot on: make backups. Because of the trauma from this one event, >>> we now have a three-way VTS grid, synchronous-mirrored SANs, and two >>> mainframes on the floor. >> I had serious discussion with some VIPs about it, approx 20 years ago >> (WTC attack). >> I had to explain we are starting DR centre with remote copy to protect >> against many disasters, BUT... >> Dedicated terrorist attack is unlikely, but when considered you cannot >> exclude coordinated attack on two (three) datacenters at the time. >> If you want to be safe you have to protect your datacenter well enough. >> And of course there is bigger bomb for bigger shelter. >> >> -- >> Radoslaw Skorupka >> Lodz, Poland >> > ====================================================================== Jeśli nie jesteś adresatem tej wiadomości: - powiadom nas o tym w mailu zwrotnym (dziękujemy!), - usuń trwale tę wiadomość (i wszystkie kopie, które wydrukowałeś lub zapisałeś na dysku). 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