ACCESS METHOD, COMPUTER AND RECORDING MEDIUM

• US 20120265907A1
• Filed: 03/13/2012
• Published: 10/18/2012
• Est. Priority Date: 04/12/2011
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: OE, Kazuichi, Ogihara, Kazutaka, Noguchi, Yasuo, Kumano, Tatsuo, Tamura, Masahisa, Tsuchiya, Yoshihiro, Watanabe, Takashi, Ozawa, Toshihiro
• Granted Patent: US 8,843,672 B2
• Time in Patent Office: Days
• US Class Current: 710/36
• CPC Class Codes: G06F 11/3409 for performance assessment
• CPC Class Codes: G06F 11/3485 for I/O devices
• CPC Class Codes: G06F 2201/81 Threshold

Abstract

An access method includes: obtaining, by a computer, a result of monitoring a busy rate and a number of access operations per unit time of a storage device, the storage device having a first storage area and a second storage area; calculating a characteristic of correlation between the busy rate and the number of access operations per unit time based on the result; calculating a second number of access operations per unit time based on the characteristic of the correlation such that a sum of a first busy rate corresponding to a first number of access operations per unit time and a second busy rate corresponding to a second number of access operations per unit time becomes equal to or lower than a given busy rate; and controlling a number of operations to access the second storage area per unit time based on the second number of access operations.

Claims

1. An access method comprising:

obtaining, by a computer, a result of monitoring a busy rate and a number of access operations per unit time of a storage device, the storage device having a first storage area and a second storage area;

calculating a characteristic of correlation between the busy rate and the number of access operations per unit time based on the result;

calculating a second number of access operations per unit time based on the characteristic of the correlation such that a sum of a first busy rate corresponding to a first number of access operations per unit time and a second busy rate corresponding to a second number of access operations per unit time becomes equal to or lower than a given busy rate; and

controlling a number of operations to access the second storage area per unit time based on the second number of access operations.

2. The access method according to claim 1, further comprising, notifying a controller to control the second storage area of the second number of access operations.

3. The access method according to claim 1, further comprising, calculating the characteristic of the correlation by dividing the busy rate by the number of access operations;

calculating the first busy rate by multiplying the characteristic of the correlation by the first number of access operations; and

calculating the second number of access operations by dividing a difference between a maximum value of the busy rate and the first busy rate by the characteristic of the correlation.

4. The access method according to claim 1, wherein the number of access operations, the first number of access operations and the second number of access operations each correspond to an Input Output Per Second value.

5. The access method according to claim 1, further comprising,

controlling a number of operations to access one of a plurality of storage areas included in the first storage area so as to become a number of access operations to the one of the plurality of storage areas by an application or below.

6. A computer comprising:

a storage device including a first storage area and a second storage area;

a controller to control a number of operations to access the second storage area per unit time so as to become a given number of access operations or below; and

a processor to executes operations,

the operations includes;

obtaining a result of monitoring a busy rate and a number of access operations per unit time of the storage device;

calculating a characteristic of correlation between the busy rate and the number of access operations per unit time based on the result;

calculating a second number of access operations per unit time based on the characteristic of the correlation such that a sum of a first busy rate corresponding to a first number of access operations per unit time and a second busy rate corresponding to a second number of access operations per unit time becomes equal to or lower than a given busy rate; and

controlling a number of operations to access the second storage area per unit time based on the second number of access operations.

7. The computer according to claim 6, wherein the operations further includes:

calculating the characteristic of the correlation by dividing the busy rate by the number of access operations;

calculating the first busy rate by multiplying the characteristic of the correlation by the first number of access operations; and

calculating the second number of access operations by dividing a difference between a maximum value of the busy rate and the first busy rate by the characteristic of the correlation.

8. The computer according to claim 6, wherein the number of access operations, the first number of access operations and the second number of access operations each correspond to an Input Output Per Second value.

9. The computer according to claim 6, wherein the operations further includes:

controlling a number of operations to access one of a plurality of storage areas included in the first storage area so as to become a number of access operations to the one of the plurality of storage areas by an application or below.

10. A non-transitory computer-readable recording medium storing a program to be executed by a computer, the program comprising a set of codes for causing the computer to execute operations of:

obtaining a result of monitoring a busy rate and a number of access operations per unit time of a storage device, the storage device having a first storage area and a second storage area;

calculating a characteristic of correlation between the busy rate and the number of access operations per unit time based on the result;

calculating a second number of access operations per unit time based on the characteristic of the correlation such that a sum of a first busy rate corresponding to a first number of access operations per unit time and a second busy rate corresponding to a second number of access operations per unit time becomes equal to or lower than a given busy rate; and

controlling a number of operations to access the second storage area per unit time based on the second number of access operations.