Information processing system and information processing method

An information processing method to be executed in an information processing system including a plurality of storage servers installed in each of a plurality of sites connected to a network,

• wherein the information processing system includes:
• a storage device which is installed in each of the sites and stores data;
• and
• a storage controller which is mounted on the storage server, provides a logical volume to a host application, and processes data to be read from and written into the storage device via the logical volume,
• wherein:
• a redundancy group including a plurality of the storage controllers installed in different sites is formed, and the redundancy group includes an active state storage controller which processes data, and a standby state storage controller which takes over processing of the data if a failure occurs in the active state storage controller;
• and
• the information processing method comprises a step of the active state storage controller executing processing of:
• storing the data from a host application installed in the same site in the storage device installed in that site;
• and
• storing redundant data for restoring data stored in a storage device of a same site in the storage device installed in another site where a standby state storage controller of a same redundancy group is installed.