Shingled magnetic recording storage system improving command completion time
The disclosed technology provides a system and method that improves command completion time in a shingled magnetic recording device system. In one implementation, the system and method include receiving a write command to write data to a first track in a band in a recording medium, seeking to a first track, reducing an on-cylinder limit (OCLIM) from a default OCLIM to a reduced OCLIM by a predetermined amount on the first track, performing write operations on the first track with the reduced OCLIM, and determining if a transfer of data to the first track band in the write operations has been substantially completed. Upon determining that a transfer of data to the first track in the write operations has been substantially completed, the OCLIM is restored from a reduced OCLIM to a default OCLIM and write operations are performed on tracks adjacent to the first track.
1. A method comprising:
receiving a write command to write data to a first track in a band in a recording medium;
seeking to the first track in the band;
reducing an on-cylinder limit (OCLIM) from a default OCLIM to a reduced OCLIM on the first track in the band by a predetermined amount; and
performing write operations on the first track with the reduced OCLIM.
2. The method of claim 1 , wherein the predetermined amount is approximately 2%.
3. The method of claim 1 , wherein the recording medium is shingled magnetic recording medium.
4. The method of claim 1 , further comprising:
determining if a transfer of data to the first track in the write operations has been substantially completed.
5. The method of claim 4 , further comprising:
restoring the OCLIM from a reduced OCLIM to a default OCLIM responsive to determining that a transfer of data to the first track band in the write operations has been substantially completed; and
performing write operations on tracks adjacent to the first track.
6. The method of claim 4 , further comprising:
performing a retry operation responsive to determining a transfer of data to the first track in the write operations has not been completed;
reducing the OCLIM from a default limit to a reduced limit; and
determining if a transfer of data to the first track in the write operations has been substantially completed.
7. The method of claim 6 , further comprising:
restoring the OCLIM from the reduced limit to the default limit responsive to determining a transfer of data to the first track band in the write operations has been substantially completed; and
performing a write operation on tracks 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 in a recording medium;
seek to a first track in the band;
reduce an on-cylinder limit (OCLIM) from a default OCLIM to a reduced OCLIM on the first track in the band by a predetermined amount; and
perform write operations on the first track in the band with the reduced OCLIM.
9. The storage device system of claim 8 , wherein the recording medium is shingled magnetic recording medium.
10. The storage device system of claim 8 , wherein the predetermined amount is approximately 2%.
11. The storage device system of claim 8 , wherein the storage controller is further configured to:
determine if a transfer of data to the first track in the band in the write operations has been substantially completed.
12. The storage device system of claim 11 , wherein the storage controller is further configured to:
restore the OCLIM from a reduced OCLIM to a default OCLIM responsive to determining that a transfer of data to the first track in the band in the write operations has been substantially completed; and
perform write operations on tracks adjacent to the first track in the band.
13. The storage device system of claim 8 , wherein the storage controller is further configured to:
perform a retry operation responsive to determining a transfer of data to the first track in the band in the write operations has not been completed;
reduce the OCLIM to a reduced limit; and
determine if a transfer of data to the first track in the band in the write operations has been substantially completed.
14. The storage device system of claim 13 , wherein the storage controller is further configured to:
restore the default OCLIM on tracks adjacent to the first track in the band responsive to determining that a transfer of data to the first track in the band in the write operations has been substantially completed; and
perform a write operation on tracks adjacent to the first track in the band.
15. 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 to a first track in a band in a recording medium;
seeking to a first track in the band;
reducing an on-cylinder limit (OCLIM) from a default OCLIM to a reduced OCLIM on the first track in the band by a predetermined amount; and
performing write operations on the first track in the band with the reduced OCLIM.
16. The one or more non-transitory computer-readable storage media of claim 15 , further comprising:
determining if a transfer of data to the first track in the band in the write operations has been substantially completed.
17. The one or more non-transitory computer-readable storage media of claim 16 , further comprising:
restoring the OCLIM from a reduced OCLIM to a default OCLIM responsive to determining that a transfer of data to the first track in the band in the write operations has been substantially completed; and
performing write operations on tracks adjacent to the first track in the band.
18. The one or more non-transitory computer-readable storage media of claim 16 , further comprising:
performing a retry operation responsive to determining a transfer of data to the first track in the band in the write operations has not been completed;
reducing the OCLIM from a default limit to a reduced limit; and
determining if a transfer of data to the first track in the band in the write operations has been substantially completed.
19. The one or more non-transitory computer-readable storage media of claim 18 , further comprising:
restoring the OCLIM from a reduced limit to a default limit responsive to determining a transfer of data to the first track in the band in the write operations has been substantially completed; and
performing a write operation on tracks adjacent to the first track in the band.
20. The one or more non-transitory computer-readable storage media of claim 15 , wherein the recording medium is shingled magnetic recording medium.