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On 11/1/18, 12:30 PM, Jerry Draper wrote:
Thinking that redundant power supply means that we can unplug one power
supply cord without causing any power issues on the system.
We lost one of our UPS systems and will replace it in a few days.
I speak from experience: it works, at least with an E4A.
We've had cases in which a UPS with worn-out batteries failed its
self-test rather catastrophically, shutting down everything connected to
it (even though there was nothing wrong with the line power). The result
is that we now have our E4A set up with one cord plugged into the UPS,
and the other plugged into the wall, and the other mission-critical
boxes fed through a rack-mount transfer switch, with one side of the
transfer switch plugged into the UPS, and the other plugged into the wall.
Of course, we also now have a UPS with a sidecar, and so it's entirely
possible that it would be necessary for both the main and sidecar
battery packs to fail catastrophically at the same time for a self-test
failure to cause a power cut.
But the point is that the whole point of having redundant power supplies
is so that if one fails, the system can, at least for a time, continue
to run.
--
JHHL
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