Disk fault tolerance method, device and system

A disk fault tolerance device, comprising:

• a receiving module, for receiving a file access request, in which an identifier of a file is carried;
• a first acquiring module, configured to acquire one or more node lists corresponding to the file according to a pre-stored correspondence between identifiers of the files and node lists as well as the identifier of the file, wherein each node list comprises at least two nodes, each node comprises a plurality of disks, there is a one-to-one correspondence between the disks included in respective nodes, and the mutually corresponding disks between the respective nodes store same contents;
• an accessing module, configured to select a node from each of the acquired node lists respectively, and access data chunks included in the file from the respective nodes selected from each of the node lists according to the identifier of the file;
• and
• a fault tolerance module, configured to select another node from the node list that comprises the certain node, and access a respective data chunk included in the file from the selected node according to the identifier of the file, when an accessing from a certain node fails.

A disk fault tolerance system, characterized in that the system comprises a client, a storage server cluster and a management server;

• the client is configured to send a file access request to the management server, wherein an identifier of a file is carried in the file access request;
• the storage server cluster comprises a plurality of storage server groups, wherein each storage server group comprises at least two storage servers, each storage server comprises a plurality of disks, there is a one-to-one correspondence between the disks included in the respective storage servers, and the mutually corresponding disks between the respective storage servers store the same contents;
• and
• the management server is configured to:
• receive the file access request sent from the client;
• acquire one or more storage server groups corresponding to the file according to a pre-stored correspondence between identifiers of the files and the storage server groups included in the storage server cluster as well as the identifier of the file;
• select a storage server from each of the acquired storage server groups respectively, and access data chunks included in the file from the respective storage servers selected from each of the storage server groups according to the identifier of the file;
• and
• select another storage server from the storage server group that comprises a certain storage server, and access a respective data chunk included in the file from the selected storage server according to the identifier of the file, when an accessing from the certain storage server fails.