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 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ::DISCLAIMER:: ---------------------------------------------------------------------------------------------------------------------------------------------------- The contents of this e-mail and any attachment(s) are confidential and intended for the named recipient(s) only. E-mail transmission is not guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or may contain viruses in transmission. The e mail and its contents (with or without referred errors) shall therefore not attach any liability on the originator or HCL or its affiliates. Views or opinions, if any, presented in this email are solely those of the author and may not necessarily reflect the views or opinions of HCL or its affiliates. Any form of reproduction, dissemination, copying, disclosure, modification, distribution and / or publication of this message without the prior written consent of authorized representative of HCL is strictly prohibited. If you have received this email in error please delete it and notify the sender immediately. Before opening any email and/or attachments, please check them for viruses and other defects. ---------------------------------------------------------------------------------------------------------------------------------------------------- ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN