Data backup method and data processing system having data maintenance function

A data backup method for a computer system having a central processing unit for performing a plurality of tasks in parallel, a multiple memory including at least two memory means and a control means for managing said memory means, and a data backup memory for backup of data stored in said memory means of said multiple memory, said method comprising the computer-executed steps of:

• successively storing operation modes of said memory means in said multiple memory into a table previously provided in said multiple memory;
• when said central processing unit issues a maintenance task for evacuating data from said memory means of said multiple memory to said backup memory, said control means performs the steps of:
• comparing an operation mode assigned to said maintenance task with said operation modes stored in said table of each said memory means of said multiple memory;
• after said comparing step, when there is no operation mode coincident with said operation mode assigned to said maintenance task in said table, changing the operation mode lastly stored in the memory means of said multiple memory means to said operation mode assigned to said maintenance task;
• and
• executing said maintenance task with respect to said memory means whose operation mode has been changed.

A data backup method for a computer system having a central processing unit for performing a plurality of tasks in parallel, a multiple memory including at least two memory means and a control means for managing said memory means, and a data backup memory for backup of data stored in said memory means of said multiple memory, said method comprising the computer-executed steps of:

• successively storing operation modes of said memory means in said multiple memory or a failure mode indicative of a failure of the memory means into a table previously provided in said multiple memory;
• when said central processing unit issues a maintenance task for evacuating data from said memory means of said multiple memory to said backup memory, said control means performs the steps of:
• comparing an operation mode assigned to said maintenance task with said operation modes stored in said table of each said memory means of said multiple memory;
• after said comparing, when there is no operation mode coincident with said operation mode assigned to said maintenance task in said table, changing the operation mode lastly stored in the memory means of said multiple memory means to said operation mode assigned to said maintenance task;
• and
• executing said maintenance task with respect to said memory means whose operation mode has been changed.

A data processing system having a central processing unit for performing a plurality of tasks in parallel, a multiple memory including at least two memory means and a memory management means for managing said memory means, and a data backup memory for backup of data stored in said memory means of said multiple memory, said multiple memory comprising:

• a table for storing an operation mode for each said memory means of said multiple memory;
• memory management means for managing said memory means comprising:
• a) comparing means for comparing an operation mode assigned to a maintenance task issued from said central processing unit for evacuating data from said memory means to said backup memory with said operation mode stored in said table of each said memory means of said multiple memory,
• b) control means for changing the operation mode of at least one memory means to said operation mode assigned to said maintenance task,
• c) execution means for starting execution of a maintenance task for evacuation of data from said at least one memory means to said data backup memory.