Title: Redundant PSUs
Review: ... hardware. Totally unnecessary for anything but critical server usage, but in that arena, these fellas operate like RAID for power supply. Don't confuse these with uninterruptable or backup power that keep your system running even if the power goes out (e.g., during a storm). Use these on the expectation that any PSU will eventually falter or *fail*, at which point the redundant unit is there to kick in. Then you "hot swap" in another functioning unit and smile.
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