Data storage method, apparatus and system, and server, control node and medium

A data storage system, comprising a control node, a master server for a to-be-split fragment, and slave servers for a to-be-split fragment, wherein,

• the control node is configured for sending a ready-to-split instruction for the to-be-split fragment to the master server;
• the master server is configured for sending the ready-to-split instruction to slave servers for the to-be-split fragment after receiving the ready-to-split instruction;
• the slave severs are configured for obtains data splitting points of the to-be-split fragment after receiving the ready-to-split instruction, and sending the data splitting points to the master server;
• the master server is further configured for sending, when the number of received data splitting points exceeds a first threshold number, data splitting points to the control node;
• the control node is further configured for sending a splitting-storage instruction to the master server after receiving the data splitting points from the master server;
• the master server is further configured for sending the splitting-storage instruction to each of the slave servers after receiving the splitting-storage instruction;
• the slave severs are further configured for performing splitting-storage on the to-be-split fragment according to the data splitting points to obtain target fragments, and sending a first message to the master server to indicate completion of the splitting-storage;
• and
• the master server is further configured for performing, when the number of received first messages exceeds a second threshold number, splitting-storage on the to-be-split fragment according to the data splitting points to obtain target fragments.