Blade server

A blade server, comprising:

• a casing having a plurality of main board slots at a first side of the casing and at least a first chassis management controller (CMC) slot and a second CMC slot at a second side of the casing opposite to the first side, wherein the plurality of main board slots are all electrically connected to the first CMC slot and the second CMC slot, and the first CMC slot is electrically connected to the second CMC slot;
• a plurality of blade server module board plugged in the plurality of main board slots;
• a first CMC plugged in the first CMC slot to be electrically connected to the plurality of blade server module boards;
• a second CMC plugged in the second CMC slot to be electrically connected to the first CMC and the plurality of blade server module boards, wherein the second CMC detects the first CMC to generate a detection signal based on whether the first CMC functions normally;
• a third switch electrically connected to the first CMC and the plurality of blade server module boards, and configured to perform a signal transmission between one among the plurality of blade server module boards and the first CMC;
• and
• a fourth switch electrically connected to the second CMC and the plurality of blade server module boards, and configure to perform a signal transmission between one among the plurality of blade server module boards and the second CMC,
• wherein when the first CMC functions normally, the plurality of blade server module boards is controlled by the first CMC based on the detection signal, and controlled by the second CMC based on the detection signal otherwise.