Re: And so? (VMS/XDE)

From	Arne Vajhøj <arne@vajhoej.dk>
Newsgroups	comp.os.vms
Subject	Re: And so? (VMS/XDE)
Date	2025-11-12 14:54 -0500
Organization	A noiseless patient Spider
Message-ID	<10f2ol5$1koun$1@dont-email.me> (permalink)
References	(6 earlier) <10eaaqr$2sqg0$1@dont-email.me> <69135b62$0$665$14726298@news.sunsite.dk> <10f07ve$107hm$6@dont-email.me> <6913cd44$0$674$14726298@news.sunsite.dk> <10f10gl$16kvh$5@dont-email.me>

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On 11/11/2025 10:56 PM, Lawrence D’Oliveiro wrote:
> On Tue, 11 Nov 2025 18:56:53 -0500, Arne Vajhøj wrote:
>> HA is about whether the system can continue to serve users in case part
>> of a box or an entire box fail - 24x7 vs 16x5 is about architecture.
> 
> High availability is measured in “nines” -- e.g. five nines, six nines ...
> even seven nines.
> 
> How do big enterprises (like Google) achieve that? By not using
> mainframes. They set up data centres full of off-the-shelf PC hardware --
> one article I remember from over a decade ago said that Google, at that
> time, had 460,000 servers.
> 
> All the hardware is obtained as cheaply as possible, except one component:
> the power supply. They buy quality for that, for power-efficiency reasons.
> As for the rest, it doesn’t matter if a box falls over every minute, or a
> hard drive crashes every few minutes; they have higher-level redundancy
> and recovery procedures that can routinely recover from all those
> failures, without the users ever noticing.
> 
> No mainframe can match that.

Of course mainframes can match that.

The fundamental mechanism is the same for mainframes and
let us call it modern distributed environments.

You need N systems running to handle load. There is
a probability Pd of one system becoming unavailable.
You want Pr probability of handling the load.

You can calculate how many systems M you need to
achieve that.

N is smaller, Pd is smaller and the cost of a
system is much bigger for mainframes than for
x86-64 servers.

But the formula is the same. You can do the math.

IBM mainframes use OS clustering (like VMS) called
SysPlex. The modern distributed environments use
pure application level clustering. But that is
the "how" not the "what".

Arne

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And so? (VMS/XDE) gcalliet <gerard.calliet@pia-sofer.fr> - 2025-10-29 15:48 +0100
  Re: And so? (VMS/XDE) Chris Townley <news@cct-net.co.uk> - 2025-10-29 15:19 +0000
    Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-10-29 19:03 -0400
      Re: And so? (VMS/XDE) Chris Townley <news@cct-net.co.uk> - 2025-10-29 23:16 +0000
        Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-10-29 19:25 -0400
          Re: And so? (VMS/XDE) cross@spitfire.i.gajendra.net (Dan Cross) - 2025-10-30 11:30 +0000
  Re: And so? (VMS/XDE) drb@ihatespam.msu.edu (Dennis Boone) - 2025-10-29 16:13 +0000
    Re: And so? (VMS/XDE) Simon Clubley <clubley@remove_me.eisner.decus.org-Earth.UFP> - 2025-10-29 18:48 +0000
      Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-10-29 15:52 -0400
        Re: And so? (VMS/XDE) Chris Townley <news@cct-net.co.uk> - 2025-10-29 21:45 +0000
      Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-10-29 15:59 -0400
      Re: And so? (VMS/XDE) gcalliet <gerard.calliet@pia-sofer.fr> - 2025-10-30 09:19 +0100
        Re: And so? (VMS/XDE) Simon Clubley <clubley@remove_me.eisner.decus.org-Earth.UFP> - 2025-10-30 13:12 +0000
          Re: And so? (VMS/XDE) gcalliet <gerard.calliet@pia-sofer.fr> - 2025-10-30 20:05 +0100
          Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-10-30 15:59 -0400
            Re: And so? (VMS/XDE) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-10-30 22:28 +0000
            Re: And so? (VMS/XDE) Simon Clubley <clubley@remove_me.eisner.decus.org-Earth.UFP> - 2025-11-03 13:31 +0000
              Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-03 15:18 -0500
              Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-03 15:28 -0500
                Re: And so? (VMS/XDE) Simon Clubley <clubley@remove_me.eisner.decus.org-Earth.UFP> - 2025-11-04 13:59 +0000
                Re: And so? (VMS/XDE) Subcommandante XDelta <vlf@star.enet.dec.com> - 2025-11-05 07:57 +1100
                Re: And so? (VMS/XDE) Simon Clubley <clubley@remove_me.eisner.decus.org-Earth.UFP> - 2025-11-05 13:25 +0000
                Re: And so? (VMS/XDE) bill <bill.gunshannon@gmail.com> - 2025-11-06 08:44 -0500
                Re: And so? (VMS/XDE) gcalliet <gerard.calliet@pia-sofer.fr> - 2025-11-20 13:05 +0100
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-04 19:34 -0500
              Re: And so? (VMS/XDE) cross@spitfire.i.gajendra.net (Dan Cross) - 2025-11-07 14:01 +0000
                Re: And so? (VMS/XDE) Simon Clubley <clubley@remove_me.eisner.decus.org-Earth.UFP> - 2025-11-10 14:12 +0000
                Re: And so? (VMS/XDE) bill <bill.gunshannon@gmail.com> - 2025-11-10 10:19 -0500
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-10 15:43 -0500
                Re: And so? (VMS/XDE) antispam@fricas.org (Waldek Hebisch) - 2025-11-11 15:23 +0000
                Re: And so? (VMS/XDE) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-11-11 20:59 +0000
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-11 19:57 -0500
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-11 20:02 -0500
                Re: And so? (VMS/XDE) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-11-12 03:51 +0000
                Re: And so? (VMS/XDE) Chris Townley <news@cct-net.co.uk> - 2025-11-12 01:50 +0000
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-11 21:00 -0500
                Re: And so? (VMS/XDE) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-11-12 03:48 +0000
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-12 15:12 -0500
                Re: And so? (VMS/XDE) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-11-12 21:01 +0000
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-12 16:06 -0500
                Re: And so? (VMS/XDE) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-11-14 23:35 +0000
                Re: And so? (VMS/XDE) antispam@fricas.org (Waldek Hebisch) - 2025-11-15 00:24 +0000
                Re: And so? (VMS/XDE) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-11-15 02:41 +0000
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-14 22:18 -0500
                Re: And so? (VMS/XDE) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-11-15 06:00 +0000
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-15 09:22 -0500
                Re: And so? (VMS/XDE) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-11-15 22:16 +0000
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-15 18:12 -0500
                Re: And so? (VMS/XDE) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-11-18 07:25 +0000
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-18 09:19 -0500
                Re: And so? (VMS/XDE) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-11-20 23:07 +0000
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-20 19:41 -0500
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-20 19:55 -0500
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-21 19:09 -0500
                Re: And so? (VMS/XDE) Andreas Eder <a_eder_muc@web.de> - 2025-11-15 12:15 +0100
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-15 08:27 -0500
                Re: And so? (VMS/XDE) Dave Froble <davef@tsoft-inc.com> - 2025-11-29 19:49 -0500
                Re: And so? (VMS/XDE) antispam@fricas.org (Waldek Hebisch) - 2025-11-30 05:44 +0000
                Re: And so? (VMS/XDE) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-11-30 06:33 +0000
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-30 14:21 -0500
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-30 14:23 -0500
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-30 16:04 -0500
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-30 16:09 -0500
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-30 16:11 -0500
                Re: And so? (VMS/XDE) Chris Townley <news@cct-net.co.uk> - 2025-11-30 21:49 +0000
                Re: And so? (VMS/XDE) antispam@fricas.org (Waldek Hebisch) - 2025-11-30 22:18 +0000
                Re: And so? (VMS/XDE) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-14 01:37 +0000
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-30 17:44 -0500
                Re: And so? (VMS/XDE) cross@spitfire.i.gajendra.net (Dan Cross) - 2025-12-01 13:37 +0000
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-12-01 16:02 -0500
                Re: And so? (VMS/XDE) cross@spitfire.i.gajendra.net (Dan Cross) - 2025-12-01 21:26 +0000
                Re: And so? (VMS/XDE) bill <bill.gunshannon@gmail.com> - 2025-12-01 17:46 -0500
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-12-01 18:50 -0500
                Re: And so? (VMS/XDE) bill <bill.gunshannon@gmail.com> - 2025-12-01 20:23 -0500
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-12-01 20:44 -0500
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-12-01 20:55 -0500
                Re: And so? (VMS/XDE) bill <bill.gunshannon@gmail.com> - 2025-12-01 22:05 -0500
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-12-01 22:18 -0500
                Re: And so? (VMS/XDE) cross@spitfire.i.gajendra.net (Dan Cross) - 2025-12-02 12:59 +0000
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-12-01 20:06 -0500
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-12-01 20:14 -0500
                Re: And so? (VMS/XDE) bill <bill.gunshannon@gmail.com> - 2025-12-01 20:15 -0500
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-12-01 20:31 -0500
                Re: And so? (VMS/XDE) bill <bill.gunshannon@gmail.com> - 2025-12-01 21:39 -0500
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-12-01 22:03 -0500
                Re: And so? (VMS/XDE) cross@spitfire.i.gajendra.net (Dan Cross) - 2025-12-02 13:50 +0000
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-12-02 10:25 -0500
                Re: And so? (VMS/XDE) cross@spitfire.i.gajendra.net (Dan Cross) - 2025-12-02 15:46 +0000
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-12-02 10:57 -0500
                Re: And so? (VMS/XDE) cross@spitfire.i.gajendra.net (Dan Cross) - 2025-12-02 19:03 +0000
                Re: And so? (VMS/XDE) Simon Clubley <clubley@remove_me.eisner.decus.org-Earth.UFP> - 2025-12-01 13:49 +0000
                Re: And so? (VMS/XDE) cross@spitfire.i.gajendra.net (Dan Cross) - 2025-12-01 18:59 +0000
                Re: And so? (VMS/XDE) Simon Clubley <clubley@remove_me.eisner.decus.org-Earth.UFP> - 2025-12-01 19:58 +0000
                Re: And so? (VMS/XDE) cross@spitfire.i.gajendra.net (Dan Cross) - 2025-12-02 15:42 +0000
                Re: And so? (VMS/XDE) Simon Clubley <clubley@remove_me.eisner.decus.org-Earth.UFP> - 2025-12-03 14:07 +0000
                Re: And so? (VMS/XDE) Dave Froble <davef@tsoft-inc.com> - 2025-12-09 00:19 -0500
                Re: And so? (VMS/XDE) cross@spitfire.i.gajendra.net (Dan Cross) - 2025-12-10 18:38 +0000
                Re: And so? (VMS/XDE) cross@spitfire.i.gajendra.net (Dan Cross) - 2025-12-01 21:23 +0000
                Re: And so? (VMS/XDE) bill <bill.gunshannon@gmail.com> - 2025-12-01 17:50 -0500
                Re: And so? (VMS/XDE) cross@spitfire.i.gajendra.net (Dan Cross) - 2025-12-02 13:56 +0000
                Re: And so? (VMS/XDE) Dave Froble <davef@tsoft-inc.com> - 2025-12-08 23:57 -0500
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-10 15:35 -0500
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-10 15:37 -0500
                Re: And so? (VMS/XDE) antispam@fricas.org (Waldek Hebisch) - 2025-11-11 14:47 +0000
                Re: And so? (VMS/XDE) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-11-11 20:54 +0000
                Re: And so? (VMS/XDE) cross@spitfire.i.gajendra.net (Dan Cross) - 2025-11-12 17:04 +0000
                Re: And so? (VMS/XDE) Simon Clubley <clubley@remove_me.eisner.decus.org-Earth.UFP> - 2025-11-13 13:42 +0000
                Re: And so? (VMS/XDE) cross@spitfire.i.gajendra.net (Dan Cross) - 2025-11-16 02:00 +0000
              Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-11 10:50 -0500
                Re: And so? (VMS/XDE) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-11-11 20:57 +0000
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-11 18:56 -0500
                Re: And so? (VMS/XDE) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-11-12 03:56 +0000
                Re: And so? (VMS/XDE) cross@spitfire.i.gajendra.net (Dan Cross) - 2025-11-12 13:43 +0000
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-12 14:54 -0500
                Re: And so? (VMS/XDE) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-11-12 21:02 +0000
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-12 16:10 -0500
                Re: And so? (VMS/XDE) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-11-14 05:47 +0000
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-14 16:49 -0500
                Re: And so? (VMS/XDE) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-11-18 07:29 +0000
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-18 13:52 -0500
                Re: And so? (VMS/XDE) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-11-20 23:09 +0000
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-20 19:31 -0500
                Re: And so? (VMS/XDE) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-11-21 01:32 +0000
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-20 19:36 -0500
                Re: And so? (VMS/XDE) David Wade <g4ugm@dave.invalid> - 2025-11-12 21:43 +0000
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-12 16:57 -0500
                Re: And so? (VMS/XDE) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-11-13 02:45 +0000
                Re: And so? (VMS/XDE) David Wade <g4ugm@dave.invalid> - 2025-11-13 10:36 +0000
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-13 16:13 -0500
                Re: And so? (VMS/XDE) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-11-14 23:39 +0000
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-14 16:58 -0500
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-12-17 21:19 -0500
                Re: And so? (VMS/XDE) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-18 06:47 +0000
                Re: And so? (VMS/XDE) "Niels S. Eliasen" <nse@eliasen.co> - 2025-12-19 11:16 +0000
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-12-19 08:07 -0500
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-12-19 08:53 -0500
        Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-10-30 15:52 -0400
          Re: And so? (VMS/XDE) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-10-30 22:26 +0000
            Re: And so? (VMS/XDE) jgd@cix.co.uk (John Dallman) - 2025-11-01 16:40 +0000
              Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-01 13:04 -0400
                Re: And so? (VMS/XDE) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-11-01 20:18 +0000
                Re: And so? (VMS/XDE) jgd@cix.co.uk (John Dallman) - 2025-11-04 22:17 +0000
                Re: And so? (VMS/XDE) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-11-04 22:25 +0000
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-04 19:13 -0500
              Re: And so? (VMS/XDE) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-11-01 20:14 +0000
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-01 20:02 -0400
                Re: And so? (VMS/XDE) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-11-02 01:34 +0000
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-01 21:44 -0400
            Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-01 17:44 -0400
              Re: And so? (VMS/XDE) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-11-01 22:13 +0000
                Re: And so? (VMS/XDE) Arne Vajhøj <arne@vajhoej.dk> - 2025-11-01 20:14 -0400
                Re: And so? (VMS/XDE) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-11-02 01:30 +0000
        Re: And so? (VMS/XDE) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-10-30 22:29 +0000

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