Disk device with bi-directional communication function
View Patent ↗A plurality of HDDs 12 - 1˜12 - n connected around a host 10 can be made to directly communicate with each other. For example, an HDD 12 - 1 makes another HDD to perform long distance seek using this communication line and measures the influence of vibration caused at that time. The measurement result is formed into a transfer function indicating the position change of the head of the relevant HDD against the operation of another HDD. An HDD is actually driven by a current value obtained by correcting the normal driving current of the driving motor of the head by the transfer function.
1. A disk device provided with a plurality of hard disk drives disposed in an environment where vibration due to an operation of the relevant disk drive affects an operation of another disk drive, comprising:
an acquisition unit for obtaining an operational state of another disk drive; and
a control unit for controlling an operation of a head of the relevant disk drive in such a way as to reduce an influence of an operation of another disk drive.
2. The disk device according to claim 1 , wherein
the operational state of the other disk drive is information about whether another disk drive is performing a seek operation with large vibration.
3. The disk device according to claim 2 , wherein when another disk drive is performing a seek operation with large vibration, the control unit defers a writing operation of the relevant disk drive.
4. The disk device according to claim 1 , wherein
the operational state of another disk drive is a driving current value of the VCM of the other disk drive, and
the control unit controls an operation of a head of the relevant disk drive in such a way as to reduce an influence of an operation of the other disk drive, using a transfer function to describe an influence on the relevant disk drive of another disk drive obtained in advance.
5. The disk device according to claim 4 , wherein
the transfer function is prepared for each other disk drive and incorporates influences obtained by the transfer functions, on the relevant disk drive of an operation of each other disk drive to control an operation of a head of the relevant disk drive, based on a driving current value obtained from each other disk drive.
6. The disk device according to claim 1 , wherein
the operational state of another disk drive is an acceleration by vibration detected by an acceleration sensor which is installed on the relevant disk drive, and
the control unit controls an operation of a head of the relevant disk drive in such a way as to kill an influence of the acceleration, using a transfer function to describe an influence on the relevant disk drive of the acceleration detected by the acceleration sensor obtained in advance.
7. The disk device according to claim 6 , wherein
the operation state of another disk drive includes information about the existence/non-existence of an operation of another disk drive,
the transfer function is prepared for each other disk drive, and
when the acceleration sensor senses acceleration by vibration during an operation of the relevant disk drive, a corresponding transfer function is selected based on the information about the existence/non-existence of an operation of another disk drive and influences obtained by the selected transfer functions, on the relevant disk drive of an operation of each other disk drive are incorporated to control an operation of a head of the relevant disk drive.
8. The disk device according to claim 6 , wherein
the operational state of another disk drive is obtained only when a transfer function describing an overall influence on the relevant disk drive of each other disk drive is obtained, and
when the acceleration sensor senses acceleration by vibration during an operation of the relevant disk drive, an operation of a head of the relevant disk drive is controlled using the transfer function describing an overall influence.
9. The disk device according to claim 1 , wherein
the operational state of another disk drive is obtained via a communication line directly connecting each disk drive.
10. A control method of a disk device provided with a plurality of disk drives disposed in an environment where vibration due to an operation of the relevant disk drive affects an operation of another disk drive, comprising:
obtaining an operational state of another disk drive; and
controlling an operation of a head of the relevant disk drive in such a way as to reduce an influence of an operation of another disk drive.