What is a Redundant Power Supply?: rawcompute.in Glossary

A redundant power supply (RPS) setup equips a server with two or more power supply units that share the electrical load. In a 1+1 configuration, the most common, two identical PSUs each capable of powering the entire server operate simultaneously. If one PSU fails, the other instantly takes the full load with zero interruption. Higher-end systems (such as 4U GPU servers drawing 3,000W+) may use 2+1 or 2+2 redundancy for additional fault tolerance.

Enterprise PSUs also support dual power feeds, where each PSU connects to a separate power distribution unit (PDU) fed by a different utility circuit or UPS. This protects against not just PSU failure but also upstream power failures. If one PDU or circuit trips, the server continues running on the other feed. For maximum reliability, each feed should come from an independent UPS system.

Why it matters when buying hardware

Never deploy production servers with a single power supply. A PSU failure without redundancy means immediate, unplanned downtime. In India, where power quality can vary, redundant power supplies with dual feeds are essential for production environments. When ordering GPU servers from rawcompute.in, verify the PSU wattage is sufficient for your configuration under full load. An 8-GPU H100 server can draw over 10 kW, requiring high-wattage PSUs. Also ensure your colocation facility can deliver the required power per rack and supports dual PDU feeds.