Storage system and power source control method thereof, storage apparatus and data processing method

A method of controlling power supply of a storage system having a host system which serves as an upper-level system, and a storage apparatus providing a first volume for reading and writing data from and to said host system, comprising:

• creating a journal regarding update history information of said first volume;
• and
• storing the created journal selectively in one of second volumes or one of first external storage apparatuses, each of which serves as a storage destination of said journal,
• wherein, at said second step, power supply control of said storage apparatus providing an alternate second volume as the storage destination of the journal or an alternate first external storage apparatus as the storage destination of the journal is executed according to the storage quantity of said journal in said one of second volumes or said one of first external storage apparatuses.

A storage system comprising:

• a host system which serves as an upper-level system;
• and
• a storage apparatus configured to provide a first volume for reading and writing data from and to said host system, wherein said storage apparatus comprises:
• a journal creation unit configured to create a journal as update history information of said first volume;
• and
• a journal storage unit configured to store said journal created by said journal creation unit selectively in one of second volumes or one of first external storage apparatuses, each of which serves as a storage destination of said journal, wherein said journal storage unit creates a snapshot formed from a data image of said first volume or commands the creation of said snapshot upon the alternation of the storage destination of said journal to the alternate second volume or alternate external storage apparatus.

A storage system comprising:

• a host system which serves as an upper-level system;
• and
• a storage apparatus configured to provide a first volume for reading and writing data from and to said host system, wherein said storage apparatus comprises:
• a journal creation unit configured to create a journal as update history information of said first volume;
• and
• a journal storage unit configured to store said journal created with said journal creation unit in one of second volumes or one of first external storage apparatuses configured as a storage destination of said journal, wherein said journal storage unit creates a snapshot formed from a data image of said first volume or commands the creation of said snapshot when the storage quantity of said journal exceeds a predetermined threshold value set to said one of second volumes or said one of first external storage apparatuses.