[TUHS] ATT Hardware

John P. Linderman jpl.jpl at gmail.com
Mon Jul 2 10:55:11 AEST 2018

So prohibiting someone from pushing a button differed in what way from
allowing them to pull a plug? I can understand there may have been some
difference in state when/if the machine was rebooted. If I just wanted the
machine to cease sucking power, what's the difference? I never wanted that
box to exist, or come back to life, in whatever color.

On Sun, Jul 1, 2018 at 8:20 PM, William Corcoran <wlc at jctaylor.com> wrote:

> No! no! no!  The 3b2 was one of the first supermicros to fully integrate
> power management with the system.   Yanking the cord would be unthinkable
> mainly because it was unnecessary.  The shutdown script would remove power
> to the the system once the system safely went down and buffers were
> flushed.   You could also depress this massive rocket switch on the side of
> the unit and it would kick off the powerdown script.  It is noteworthy that
> the 3b2 power switch was stateless...allowing human and computer to turn
> off the power.
> Finally, the 3b2 is probably the only system in the world with system
> diagnostics so in depth that they were nearly as significant as the
> operating system.   It’s a telecommunications thing.   Interestingly,  the
> color of the 3b2 was similar to a VAX Brown and White.
> On Jul 1, 2018, at 6:24 PM, John P. Linderman <jpl.jpl at gmail.com> wrote:
> Puns aside, anyone who didn't consider pulling the plug was probably not
> someone who should be bringing the system down.
> On Sat, Jun 30, 2018 at 10:17 PM, Greg 'groggy' Lehey <grog at lemis.com>
> wrote:
>> On Saturday, 30 June 2018 at  7:15:07 -0400, Norman Wilson wrote:
>> > Ron Natalie:
>> >
>> >   My favorite 3B2ism was that the power switch was soft (uncommon then,
>> not so
>> >   much now).   I seem to recall that if the logged in user wasn't in a
>> >   particular group, pushing the power button was a no-op.   You didn't
>> have
>> >   sufficient privs to operate the power.
>> >
>> > ====
>> >
>> > Surely you mean the current user didn't have sufficent power.
>> Or was experiencing too much resistance?
>> Greg
>> --
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