Io control method and program and computer

A control method, comprising:

• obtaining, by using a computer, a first monitoring result concerning a busy rate and the number of accesses per unit time with respect to a storage device including a first storage area and a second storage area;
• determining, by using the computer, from the obtained first monitoring result, whether or not an event that a first indicator value for the busy rate is reset occurs;
• upon determining that the event occurred, notifying, by using the computer, a controller that makes the number of accesses per unit time for the second storage area equal to or less than the notified number of accesses of the first number of accesses per unit time, which is less than the second number of accesses per unit time, which was notified immediately before;
• obtaining, by using the computer, a second monitoring result concerning the busy rate and the number of accesses per unit time;
• updating, by using the computer, the first indicator value based on at least the obtained second monitoring result;
• calculating, by using the computer, the third number of accesses per unit time based on the second monitoring result so that a sum of a busy rate corresponding to the third number of accesses per unit time and a busy rate corresponding to the designated number of accesses per unit time becomes equal to the updated first indicator value;
• and
• notifying, by using the computer, the controller of the calculated third number of accesses per unit time.

A computer, comprising:

• a storage device including a first storage area and a second storage area;
• a controller that makes the number of accesses per unit time for the second storage area in the storage device equal to or less than the notified number of accesses;
• and
• a processing unit, and
• wherein the processing unit executes a procedure comprising:
• obtaining a first monitoring result concerning a busy rate and the number of accesses per unit time with respect to the storage device;
• determining, from the obtained first monitoring result, whether or not an event that a first indicator value for the busy rate is reset occurs;
• upon determining that the event occurred, notifying the controller of the first number of accesses per unit time, which is less than the second number of accesses per unit time, which was notified immediately before;
• obtaining a second monitoring result concerning the busy rate and the number of accesses per unit time;
• updating the first indicator value based on at least the obtained second monitoring result;
• calculating the third number of accesses per unit time based on the second monitoring result so that a sum of a busy rate corresponding to the third number of accesses per unit time and a busy rate corresponding to the designated number of accesses per unit time becomes equal to the updated first indicator value;
• and
• notifying the controller of the calculated third number of accesses per unit time.