Method and system for taking over devices

A control apparatus, comprising:

• a topology discovery module, configured to perform a topology discovery on a Peripheral Component Interconnect Express (PCIE) bus;
• a resource reservation module, configured to reserve resources for a Switch (SW) where a NON-Transparent (NT) bridge is located and a device connected to a down port of the SW according to a set resource reservation policy when the topology discovery proceeds to the NT bridge, wherein the SW and the device are currently controlled by another control apparatus;
• and
• a takeover module, configured to take over the SW and the device connected to the down port of the SW from the another control apparatus when the another control apparatus has a fault, and allocate the resources reserved by the resource reservation module to the SW and the device.

A system for dual controlling, comprising a first control board and a second control board, wherein

• the first control board is configured to:
• perform a topology discovery on a Peripheral Component Interconnect Express (PCIE) bus;
• reserve resources for a Switch (SW) where a NON-Transparent (NT) bridge is located and a device connected to a down port of the SW according to a set resource reservation policy when the topology discovery proceeds to the NT bridge, wherein the SW where the NT bridge is located and the device are currently controlled by the second control board;
• and
• take over the SW and the device from the second control board when the second control board has a fault, and allocate the reserved resources to the SW and the device.