Storage system

A storage system comprising:

• N horizontal backplanes, wherein each horizontal backplane comprises a first controller and a second controller on a same plane, and the N horizontal backplanes are disposed in parallel;
• and
• a first mirror backplane, wherein
• first controllers on the N horizontal backplanes form a first column in a vertical direction;
• second controllers on the N horizontal backplanes forming a second column in a vertical direction;
• the first mirror backplane is perpendicular to the horizontal backplanes, a first side of the first mirror backplane is connected to the N horizontal backplanes, and a second side of the first mirror backplane is connected to the first controller and the second controller;
• a second side of the first controller has N second mirror ports and N second heartbeat ports, a first side of the second controller has N first mirror ports and N first heartbeat ports, a first mirror port of the second controller is interconnected to a second mirror port of the first controller, and a first heartbeat port of the second controller is interconnected to a second heartbeat port of the first controller;
• and
• wiring on the first mirror backplane comprises wiring interconnecting the first mirror port of the second controller to the second mirror port of the first controller, and wiring interconnecting the first heartbeat port of the second controller to the second heartbeat port of the first controller,
• wherein N is a positive integer.