FYI Netflix is down

Sat Jun 30 11:48:45 UTC 2012

On 6/30/12, Grant Ridder <shortdudey123 at gmail.com> wrote:
> well one would think that they could at least get power redundancy right...

It is very similar to suggesting redundancy within a site against
building collapse.

Reliable power redundancy is very hard and very expensive.    Much
harder and much more expensive  than  achieving network redunancy
against switch or router failures.
And there are always tradeoffs involved,   because there is only one
utility grid available.
There are always some limitations in the amount of isolation possible.

You have devices plugged into both power systems.
There is some possibility a random device plugged into both systems
creates a short in both branches that it plugs into.

Both power systems always have to share the same ground, due to safety
considerations.

Both power systems always have to have fuses or breakers installed,
due to safety considerations,   and  there is always a possibility
that  various kinds of anomolies
cause fuses to simultaneously blow in both systems.

--
-JH