Regarding eggs and backets.
This is english proverb, not used in Poland.
I rather use electricity example: serial and parallel connection of
light bulbs. The idea of two datacenters is to have bulbs in parallel -
one may fail, but the other will work. However sometimes (especially in
Windows world) it is deviated to serial connection - both datacenter
have to work, otherwise you have business outage.
Of course if your system consist of three elements (eggs) and all of
them have to be working, then single basket (dc) is good choice. And it
is good idea to think about another basket with copies of the eggs.
Regards
--
Radoslaw Skorupka
Lodz, Poland
W dniu 08.07.2020 o 21:05, Jesse 1 Robinson pisze:
The biggest off-color swan on the West Coast by far is earthquake. Wildfire is
also on the list as well as tsunami. Some years ago (the old) Bank of America
came close to shutting down their downtown LA data center because of civil
unrest. In the age of climate change, flooding is not out of the question.
As to probabilities, I like to question the 'all eggs in one basket' trope. If
you have a dozen eggs *every one of which is vital*, you might as put them all
in one basket and resolve to take very good care of it. If some of the eggs are
dispensable, then distribute them in multiple baskets. The more baskets you
have to take care of, the greater the risk that one or more will fail.
.
.
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 <[email protected]> On Behalf Of
Charles Mills
Sent: Wednesday, July 8, 2020 9:13 AM
To: [email protected]
Subject: (External):Re: Storage & tape question
CAUTION EXTERNAL EMAIL
Unlikely?
Black swans do happen. How unlikely is a world-wide pandemic that cripples
economies around the world?
Charles
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf
Of R.S.
Sent: Wednesday, July 8, 2020 2:33 AM
To: [email protected]
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.
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