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
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