Data storage method, SDN controller and distributed network storage system

Abstract

The embodiment of the invention provides a data storage method, an SDN controller and a distributed network storage system. Metadata management nodes and data nodes of the distributed network storage system are connected and communicated with one another through an SDN interchanger, and the SDN interchanger is further connected with the SDN controller. The metadata management nodes send the backup mapping relationship of objective data nodes to the SDN controller, so that the SDN controller can generate a first flow table item according to the backup mapping relationship of the objective data nodes and send the first flow table item to the SDN interchanger. The first flow table item comprises addresses of the objective data nodes and addresses of backup data nodes of the objective data nodes, and the SDN interchanger broadcasts the writing request sent by a client according to metadata to the objective data nodes and the backup data nodes according to the first flow table item. Due to the fact that the SDN interchanger broadcasts the writing request to both the objective data nodes and the backup data nodes simultaneously, I / O time delay generated when data to be written are stored from the objective data nodes are stored to backup data nodes is reduced.

Description

technical field [0001] The embodiments of the present invention relate to data communication technology, and in particular to a data storage method, an SDN controller and a distributed network storage system. Background technique [0002] With the demand for massive data storage, the traditional storage system can no longer meet the needs of users. Therefore, the application of distributed storage system was born. Although the distributed storage system can meet the needs of massive data storage, due to the large network delay of the distributed storage system, it can only be used in application scenarios that are not sensitive to delay. [0003] figure 1 It is a schematic structural diagram of an existing distributed network storage system, such as figure 1 As shown, the distributed network storage system includes a metadata management node and multiple data nodes (data nodes), and the metadata management node manages the name space of the distributed network storage syst...

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Problems solved by technology

[0004] Through the above description, when the client writes the data to be written to the primary data node, and the primary data node writes the data to be written to the backup data node, it needs to go through the network operation multiple times. The delay of one network operation is about 200us, so , the existing distributed network storage system has a large network delay, which limits its application to application scenarios that are not sensitive to delay

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