Apparatus and method for dynamic multiple actuator drive data access

• US 10,090,017 B2
• Filed: 03/08/2015
• Issued: 10/02/2018
• Est. Priority Date: 03/08/2015
• Status: Active Grant

• Current Assignee: Delphi Memory Technologies, Inc.
• Original Assignee: Delphi Memory Technologies, Inc.
• Inventors: Gartee, Larry D.
• Primary Examiner(s): Butcher, Brian
• Application Number:
  US14/641,387
• Publication Number:
  US 20160260458A1
• Time in Patent Office: 1,304 Days
• Field of Search: None
• CPC Class Codes: G06F 3/0613 in relation to throughput
• CPC Class Codes: G06F 3/0647 Migration mechanisms
• CPC Class Codes: G06F 3/0658 Controller construction arrangements
• CPC Class Codes: G06F 3/0674 Disk device
• CPC Class Codes: G11B 21/025 of rotating discs
• CPC Class Codes: G11B 5/012 Recording on, or reproducing or erasing from, magnetic disks G11B17/00, G11B19/00 take precedence
• CPC Class Codes: G11B 5/4886 relative to rotating disc
• CPC Class Codes: G11B 5/5578 Multiple actuators addressing the same disk, e.g. to improve data rate or access rate

Abstract

An apparatus and method for dynamic multiple actuator drive data access includes: partitioning a data package of a received data transfer request into a plurality of data segments; assigning actuator drivers and actuator controllers; initiating a data transfer to or from the data storage medium using one or more of the plurality of actuators corresponding to the one or more assigned actuator controllers; storing or retrieving an individual data package of the data transfer request to or from the data storage medium wherein the entire data package is wholly accessible to a single actuator, if the data transfer request is a random data mode request; and storing or retrieving an individual data segment of the data transfer request to or from the data storage medium wherein the data package is accessible to the plurality of actuators, if the request is a parallel data mode request.

Claims

1. A data storage system comprising:

a data storage medium having a disk with magnetically encoded data;

a plurality of actuators for accessing data stored on the data storage medium, the plurality of actuators each being mounted on a different shaft at different locations around a surface of the data storage medium, the different locations being different angular positions relative to the center of the data storage medium, the different locations not being concentric, each actuator of the plurality of actuators being physically configured to access only a portion of the available tracks on the data storage medium and different subsets of the available tracks, each actuator being positioned adjacent to a subset of the available tracks and an arm of each actuator being physically configured to rotate only through a pre-defined subset of tracks; and

a disk controller configured to;

receive a data transfer request including at least one data package;

determine a type of the data transfer request;

partition the data package into a plurality of data segments, if the data transfer request is a parallel data mode request;

assign one or more actuator drivers and one or more actuator controllers for the data transfer request;

initiate a data transfer to or from the data storage medium using one or more of the plurality of actuators corresponding to the one or more assigned actuator controllers;

store or retrieve an individual data package of the data transfer request to or from the data storage medium wherein the entire data package is wholly accessible to a single actuator, if the data transfer request is a random data mode request; and

store or retrieve an individual data segment of the data transfer request to or from the data storage medium wherein the data package is accessible to the plurality of actuators, if the request is a parallel data mode request.

2. The data storage system of claim 1 wherein the data transfer request includes information indicative of the type of the data transfer request.

3. The data storage system of claim 1 wherein the type of the data transfer request can be inferred from the data transfer request.

4. The data storage system of claim 1 wherein the type of the data transfer request can be determined from a profile.

5. The data storage system of claim 1 further including an interface to a host environment.

6. A method comprising:

providing a data storage medium and a plurality of actuators for accessing data stored on the data storage medium, the data storage medium having a disk with magnetically encoded data, the plurality of actuators each being mounted on a different shaft at different locations around a surface of the data storage medium, the different locations being different angular positions relative to the center of the data storage medium, the different locations not being concentric, each actuator of the plurality of actuators being physically configured to access only a portion of the available tracks on the data storage medium and different subsets of the available tracks, each actuator being positioned adjacent to a subset of the available tracks and an arm of each actuator being physically configured to rotate only through a pre-defined subset of tracks;

receiving a data transfer request including at least one data package;

determining a type of the data transfer request;

partitioning the data package into a plurality of data segments, if the data transfer request is a parallel data mode request;

assigning one or more actuator drivers and one or more actuator controllers for the data transfer request;

initiating a data transfer to or from the data storage medium using one or more of the plurality of actuators corresponding to the one or more assigned actuator controllers;

storing or retrieving an individual data package of the data transfer request to or from the data storage medium wherein the entire data package is wholly accessible to a single actuator, if the data transfer request is a random data mode request; and

storing or retrieving an individual data segment of the data transfer request to or from the data storage medium wherein the data package is accessible to the plurality of actuators, if the request is a parallel data mode request.

7. The method of claim 6 wherein the data transfer request includes information indicative of the type of the data transfer request.

8. The method of claim 6 wherein the type of the data transfer request can be inferred from the data transfer request.

9. The method of claim 6 wherein the type of the data transfer request can be determined from a profile.

10. The method of claim 6 further including interfacing with a host environment.