Do dual-corded servers, connected to separate uninterruptible power supplies, draw power from both UPS systems?
Yes. Furthermore, something is wrong if the server is not drawing power from both supplies equal amounts. However, there is a caveat when implementing dual-corded equipment in your data center, particularly if you use Power over Ethernet (PoE). There have been some devices put on the market that claim to be “dual-corded,” but in actuality simply have two power cords tied together inside the box that run to a single UPS. This misleading and useless arrangement allowed them to advertise their product as “dual-corded.” These products are also potentially dangerous to your data center. In dual-corded equipment, each power supply is intended to draw power from a different source that is running at less than 50% of its capacity. Both power supplies share the load equally at all times. If power is shut down to one cord, or if one internal power supply fails, the total load is instantly picked up by the other supply, which still has the capacity to handle the total load. The same principle app
