Wide stripe data storage and constructing, repairing and updating method thereof

A wide stripe data storage, characterized in that a stripe is (n, k, r, z) and comprises local groups and a global group;

• n is a total number of all data blocks and parity blocks in the wide stripe, k is a number of all data blocks in the wide stripe, r is a number of data blocks included in each of the local groups, z is a total number of racks,
• a node fault-tolerant capability of the wide stripe is f;
• the global group comprises one rack for storing global parity blocks, and a number of the global parity blocks is f−1;
• each of the local groups comprises M racks, and different storage nodes are disposed in each of the racks;
• each of the storage nodes is used to store one of the data blocks or a local parity block;
• in a case that each of the local groups stores the one local parity block and r data blocks and each of the M racks included in each local group is provided with c storage nodes, M=(r+1)/c, wherein one of the M racks uses c−1 storage nodes to store c−1 data blocks and uses one storage node to store one local parity block, and each of remaining racks uses c storage nodes to store c data blocks,
• based on a fault-tolerant attribute of the rack, c is less than or equal to the node fault-tolerant capability f.