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From: Lawrence D'Oliveiro <ldo@nz.invalid>
Newsgroups: comp.arch
Subject: Re: what's a mainframe, was is Vax addressing sane today
Date: Thu, 12 Sep 2024 04:31:49 -0000 (UTC)
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On Wed, 11 Sep 2024 16:21:19 -0000 (UTC), John Levine wrote:

> They also care deeply about reliability. Modern mainframes have multiple
> kinds of error checking and standby CPUs that can take over from a
> failed CPU, restart a failed instruction, and the program doesn't
> notice.

This “mainframe reliability” seems to be a persistent myth. There is a 
document at Bitsavers, dating from 1986, which says that, if you want to 
turn daylight saving on or off on an IBM mainframe, you really should 
reboot.