Redundant power and dual feeds
A single power supply is a single point of failure with a cord attached. For anything that must stay up, two of them on separate feeds removes it.
How it works
A server with dual power supplies draws from both at once; either can carry the whole load alone. Wire each to an independent feed and the machine shrugs off a failed supply, a tripped circuit or maintenance on one side of the power path. The operating system never notices.
When it is worth it
For a production machine whose downtime costs real money, redundant power is cheap insurance against one of the more common hardware faults. For a stateless node behind a load balancer, where you can lose one box without flinching, a single supply may be the right economy. It is the same calculation as cost of downtime.
Order it that way
Redundant supplies and independent feeds are a build-time choice, so tell us when you spec the machine. It pairs with the rest of resilient design — ECC memory, RAID, bonded NICs — to remove the single points one by one. We can confirm the feed arrangement for your rack.
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