Shingled magnetic recording storage system during vibration

Patent metadata

Field	Value
Publication number	US-10249338-B2
Application number	US-201815952754-A
Country	US
Kind code	B2
Filing date	Apr 13, 2018
Priority date	May 8, 2017
Publication date	Apr 2, 2019
Grant date	Apr 2, 2019

Abstract

The disclosed technology provides a method that improves SMR throughput in vibration in storage systems. In one implementation, the method comprises receiving a write command to write data on a first track in a band of a storage medium, performing a vibration detection scheme to identify vibration events, determining if a number of vibration events is above a predetermined threshold, skipping the first track responsive to determining the number of vibration events is above a predetermined threshold, seeking to a second track adjacent to the first track, increasing an OCLIM on the second track adjacent to the first track from a default OCLIM to an increased OCLIM, and shifting the writer center on the second track adjacent to the first track.

First claim

What is claimed is:

1. A method comprising:
receiving a write command to write data on a first track in a band of a storage medium;
skipping the first track responsive to determining a number of vibration events is above a vibration predetermined threshold;
seeking to a second track adjacent to the first track; and
increasing an on-cylinder limit (OCLIM) on the second track adjacent to the first track from a default OCLIM to an increased OCLIM.

2. The method of claim 1 , further comprising:
writing data on the first track with the default OCLIM responsive to determining a frequency of vibration events is below a predetermined frequency threshold.

3. The method of claim 1 , further comprising:
performing a vibration detection scheme to identify vibration events; and
determining if a number of vibration events is above a predetermined vibration threshold.

4. The method of claim 1 , wherein determining a frequency of vibration events is below a predetermined frequency threshold is responsive to determining no vibration is detected.

5. The method of claim 1 , further comprising:
designating the skipped first track as skipped in a mapping table.

6. The method of claim 1 , further comprising:
shifting a writer center on the second track adjacent to the first track.

7. The method of claim 1 , further comprising:
writing data on the second track adjacent to the first track.

8. A storage device system, comprising:
a storage controller configured to:
receive a write command to write data to a first track in a band of a storage medium;
seek to a first track in the band;
skip the first track responsive to determining a number of vibration events is above a vibration predetermined threshold; and
increase an on-cylinder limit (OCLIM) on a second track from a default OCLIM to an increased OCLIM by a predetermined amount.

9. The storage device system of claim 8 , further comprising:
a vibration sensor configured to detect vibration in a storage device.

10. The storage device system of claim 8 , wherein the storage medium includes a media cache with segment-based dynamic mapping and the storage controller is configured to skip at least one unmapped segment on a track in the band.

11. The storage device system of claim 8 , wherein the storage medium is a shingled magnetic recording storage medium.

12. The storage device system of claim 8 , wherein the storage controller is further configured to shift a writer center on the second track adjacent to the first track.

13. The storage device system of claim 8 , wherein the storage controller is further configured to write data on the second track adjacent to the first track.

14. The storage device system of claim 8 , wherein the storage controller is further configured to write data on the first track with a default OCLIM responsive to determining a frequency of vibration events is below a predetermined threshold.

15. The storage device system of claim 8 , wherein the storage controller is further configured to:
perform a vibration detection scheme via vibration detection module to identify a number of vibration events detected by the vibration sensor;
determine if the number of vibration events is above a predetermined threshold;
skip to a second track adjacent to the first track responsive to determining the number of vibration events is above a predetermined threshold; and
increase the on-cylinder limit (OCLIM) on the first track from a default OCLIM to an increased OCLIM.

16. The storage device system of claim 15 , wherein the storage controller is further configured to designate a skipped track as skipped in a mapping table.

17. One or more non-transitory computer-readable storage media encoding computer-executable instructions for executing on a computer system a computer process, the computer process comprising:
receiving a write command to write data on a first track in a band of a storage medium;
skipping the first track responsive to determining a number of vibration events is above a vibration predetermined threshold;
seeking to a second track adjacent to the first track; and
increasing an on-cylinder limit (OCLIM) on the second track adjacent to the first track from a default OCLIM to an increased OCLIM.

18. The one or more non-transitory computer-readable storage media of claim 17 , further comprising:
performing a vibration detection scheme to identify vibration events; and
determining if a number of vibration events is above a predetermined vibration threshold.

19. The one or more non-transitory computer-readable storage media of claim 17 , further comprising designating the skipped first track as skipped in a mapping table.

20. The one or more non-transitory computer-readable storage media of claim 17 , further comprising shifting a writer center on the second track adjacent to the first track.

Assignees

• Seagate Technology Llc

Inventors

• Qiang Jian
• Liu Xiong

Classifications

• G11B27/36

  Monitoring, i.e. supervising the progress of recording or reproducing {(for digital recording G11B20/00 and s.gr.; for monitoring, testing or measuring of TV recorders of the type covered by H04N5/76 and subgroups, see H04N17/06)} · CPC title

• G11B2220/2516

  Hard disks · CPC title

• G11B20/18

  Error detection or correction; Testing {, e.g. of drop-outs} · CPC title

• G11B20/1217 Primary

  on discs · CPC title

• G11B2020/10916

  Seeking data on the record carrier for preparing an access to a specific address · CPC title