Abstract: A first node is configured to connect a second node to form a node group, wherein the first node and the second node have a first datum and a second datum respectively, the first datum has the same content as the second datum, and the first node includes a storage device and a server. The server is configured to electrically connect the storage device and has a processor including a Linux program arbiter communicating with the second node, wherein the Linux program arbiter includes a permitting unit and a write-protection unit. The permitting unit is configured to allow a first request when receiving the first request for overwriting the first datum, and the write-protection unit is configured to prevent the second node from overwriting the second datum before the first datum is overwritten by a third datum and the second node replaces the second datum with the third datum.

Abstract: A first node is configured to connect a second node to form a node group, wherein the first node and the second node have a first datum and a second datum respectively, the first datum has the same content as the second datum, and the first node includes a storage device and a server. The server is configured to electrically connect the storage device and has a processor including a Linux program arbiter communicating with the second node, wherein the Linux program arbiter includes a permitting unit and a write-protection unit. The permitting unit is configured to allow a first request when receiving the first request for overwriting the first datum, and the write-protection unit is configured to prevent the second node from overwriting the second datum before the first datum is overwritten by a third datum and the second node replaces the second datum with the third datum.