Methods for reducing operational latency of data storage systems

• US 9,236,086 B1
• Filed: 10/15/2014
• Issued: 01/12/2016
• Est. Priority Date: 10/15/2014
• Status: Active Grant

• Current Assignee: Western Digital Technologies Incorporated (Western Digital Corporation)
• Original Assignee: Western Digital Technologies Incorporated (Western Digital Corporation)
• Inventors: Burton, Scott, Gosla, Asif F.
• Primary Examiner(s): Wong, K.
• Application Number:
  US14/514,689
• Time in Patent Office: 454 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: G11B 20/10527 Audio or video recording; Data buffering arrangements G11B20/12 - G11B20/18 take precedence
• CPC Class Codes: G11B 20/1217 on discs
• CPC Class Codes: G11B 5/012 Recording on, or reproducing or erasing from, magnetic disks G11B17/00, G11B19/00 take precedence

Abstract

Systems and methods for reducing operational latency of data storage systems are disclosed. More particularly, a data storage device can perform conditioning operations on inactive zones while the data storage device is idle. When an active zone is the target of a write command, the data storage device can exchange a conditioned inactive zone for the unconditioned target zone. The write operation can be performed immediately on the previously-inactive already-conditioned zone. At a later time, the target zone can be conditioned.

Claims

1. A method for writing data to a data storage system, the method comprising:

receiving a reset command for a sequential write pointer of a first zone of a plurality of active zones defined in the data storage system, the first zone associated with a first pointer;

updating a status of a second zone not within the plurality of active zones to an active status; and

updating a status of the first zone to an inactive status.

2. The method of claim 1, wherein the data storage system comprises a shingled magnetic recording system.

3. The method of claim 1, further comprising conditioning the first zone after updating the status of the first zone to an inactive status.

4. The method of claim 3, wherein conditioning the first zone comprises conditioning physical disk sectors.

5. The method of claim 3, wherein conditioning the first zone comprises validating media defects associated with the first zone.

6. The method of claim 3, wherein conditioning the first zone comprises managing relocation lists associated with the first zone.

7. The method of claim 3, wherein conditioning the first zone is performed with the data storage system is in an idle state.

8. The method of claim 1, further comprising:

releasing all write-relocated sectors of the first zone;

determining a plurality of write-relocated sectors are failing sectors; and

preventing future writes to the failing sectors.

9. The method of claim 8, further comprising writing a known pattern to all write-relocated sectors that are not failing sectors.

10. The method of claim 1, further comprising:

associated the first pointer with an auxiliary zone queue, the auxiliary zone queue comprising a plurality of pointers not within an active zone map;

removing from the auxiliary zone queue, a second pointer to a second zone, the second pointer from the plurality of pointers not within the active zone map; and

updating the zone map to replace the first pointer with the second pointer.

11. A data storage system comprising:

a data storage device; and

a controller configured to;

receive a reset command for a sequential write pointer of a first zone of a plurality of active zones defined in the data storage device, the first zone associated with a first pointer;

update a status of a second zone not within the plurality of active zones to an active status; and

update a status of the first zone to an inactive status.

12. The data storage system of claim 11, wherein the data storage device comprises a shingled magnetic recording system.

13. The data storage system of claim 11, wherein the controller is further configured to condition the first zone after updating the status of the first zone to an inactive status.

14. The data storage system of claim 13, wherein the controller is further configured to condition the first zone by conditioning physical disk sectors.

15. The data storage system of claim 11, wherein the controller is further configured to validate media defects associated with the first zone.

16. The data storage system of claim 11, wherein the controller is further configured to manage relocation lists associated with the first zone.

17. The data storage system of claim 11, wherein conditioning the first zone is performed with the data storage system is in an idle state.

18. The data storage system of claim 11, wherein the controller is further configured to:

release all write-relocated sectors of the first zone;

determine a plurality of write-relocated sectors are failing sectors; and

prevent future writes to the failing sectors.

19. The data storage system of claim 18, further comprising writing a known pattern to all write-relocated sectors that are not failing sectors.

20. A controller for managing a data storage device associated with a data storage system, the controller configured to:

receive a reset command for a sequential write pointer of a first zone of a plurality of active zones defined in the data storage device, the first zone associated with a first pointer;

update a status of a second zone not within the plurality of active zones to an active status; and

update a status of the first zone to an inactive status.