Computer system, file storage apparatus, and storage control method

A file storage apparatus, comprising:

• a storage device;
• and
• a controller which is coupled with a cloud storage apparatus coupled with another file storage apparatus and which is coupled with the storage device, wherein
• the controller is configured to store a file system in the storage device, and when executing a manipulation of the file system, transmit manipulation information representing the executed manipulation to the cloud storage apparatus,
• a manipulation history which is a history of the manipulation information is stored in the cloud storage apparatus,
• when the controller receives a command for a specific manipulation of the file system, a specific apparatus which is any of the controller and the cloud storage apparatus is configured to, based on a state of the file system and the manipulation history, determine whether or not an unapplied manipulation affects a target of the specific manipulation, the unapplied manipulation being a manipulation which has been previously executed by the other file storage apparatus and which has not been applied to the file system, and
• the controller is configured to, when determination is made that the unapplied manipulation affects the target of the specific manipulation, apply the unapplied manipulation to the file system, execute the specific manipulation on the file system, and transmit manipulation information representing the specific manipulation to the cloud storage apparatus.

A storage control method, comprising:

• storing a file system by using a file storage apparatus and, when executing a manipulation of the file system, transmitting manipulation information representing the executed manipulation to a cloud storage apparatus coupled with another file storage apparatus;
• storing a manipulation history which is a history of the manipulation information by using the cloud storage apparatus;
• when the file storage apparatus receives a command for a specific manipulation of the file system, determining, based on a state of the file system and the manipulation history, whether or not an unapplied manipulation affects a target of the specific manipulation by using a specific apparatus which is any of the file storage apparatus and the cloud storage apparatus, the unapplied manipulation being a manipulation which has been previously executed by the other file storage apparatus and which has not been applied to the file system;
• and
• when determination has been made that the unapplied manipulation affects the target of the specific manipulation, applying the unapplied manipulation to the file system, executing the specific manipulation on the file system, and transmitting manipulation information representing the specific manipulation to the cloud storage apparatus using the file storage apparatus.