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Date: Mon, 12 Jul 2021 12:08:59 -0700
Subject: Re: [EE] Redundant PSU for critical NAS server
Thread-Topic: [EE] Redundant PSU for critical NAS server
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On Mon, 12 Jul 2021 11:16:37 -0700
"Harold Hallikainen" <harold@mai.hallikainen.org> wrote:

> ... In any
> case, I wonder if the outputs of such supplies could just be
> connected in parallel. There's already a diode in each supply.=20

I think that is the arrangement in systems I dealt with that had N+1
supplies for reliability. The particular system i am thinking of (it
was 25 years ago now) was a disk subsystem for mainframe connection
which could take up to 8 power supplies, each time you added a
disk drive to the system you also added a power supply. A maximum
populated system required 7 supplies to run plus one spare. The
supplies were also hot swappable, so when you had a failure it could be
pulled without taking down the system, and its replacement fitted.

The system was also complicated by provision for two mains inputs to
the system. I don't know how the power supplies were set up internally
to handle this, I don't believe that the supplies were split between
mains supplies.
--=20
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