In that case, "6 nines" 99.999999%
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf
Of Paul Gilmartin
Sent: Thursday, July 6, 2017 12:45 PM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: IBM Knowledge Center
On Thu, 6 Jul 2017 14:25:21 -0300, Clark Morris wrote:
>>
>>In the case of z/OS Parallel Sysplex, it is "5 nines" 99.99999%
>>
Errr... I count seven nines there.
https://en.wikipedia.org/wiki/High_availability#.22Nines.22
>>This equates to about 3 seconds of non-availability per year.
>>
Five nines would be about 5 minutes of non-availability per year.
https://en.wikipedia.org/wiki/High_availability#Percentage_calculation
>>Tools/techniques exist in the *nix world to provide this availability (or at
>>least something much better that we currently receiving). It is a matter of
>>"IBM's will" to implement or not.
>>
Not "will", but economics. End-to-end reliability would be improved only
negligibly by improving server reliability multiple orders of magnitude above
the limiting factor, the Internet. However, I agree with the consensus that KC
isn't even close.
-- gil
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