Computer system and data processing method

A data processing method for a computer system that allocates master data and replica data that is reproduction of the master data in a plurality of server devices in a distributed manner, the data processing method comprising:

• configuring, by capacity management means, a storage area management range covering the plurality of server devices as a range;
• providing in advance, by the capacity management means, in the range, a temporary area for dynamic control of a total capacity to a master server that is one of the plurality of server devices in which the master data is allocated and a slave server that is one of the plurality of server devices in which the replica data is allocated;
• managing, by the capacity management means, a use status of the temporary area of each of the master server and the slave server with a capacity management table;
• determining, by the capacity management means, whether a data write request for requesting writing of data is executable or not based on the use status of the temporary area of the master server and the use status of the temporary area of the slave server in the capacity management table of a range to which the data requested to be written by the data write request belongs;
• causing, by data processing means, both of the master server and the slave server to execute the data write request when the data write request is determined to be executable;
• and
• preventing, by the data processing means, both of the master server and the slave server from executing the data write request when the data write request is determined to be inexecutable.