Must be the season for it - except of course your seasons are all
backwards anyway ....  ;-)

Couple of weeks ago we had a customer that had *3* (separate) failures
in the protection hardware. No power blips, no storms; just our mate
Murphy.
Stuck between UPS and mains - no power to all the gear protected by the
UPS. Everything else stayed up.
Oooops.

The initial failure was a diode on a monitor card for the UPS. Cascaded
from there - hardware that we do test, failed when needed.
I don't care what anyone says, you *cannot* plan (and test) for
everything. That's why you have contingencies like backup site(s).
Fortunately it didn't come to initiating a full DR scenario.

Shane ...

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