STORAGE CONTROL SYSTEM WITH WRITE AMPLIFICATION CONTROL MECHANISM AND METHOD OF OPERATION THEREOF

• US 20130061019A1
• Filed: 08/31/2012
• Published: 03/07/2013
• Est. Priority Date: 09/02/2011
• Status: Active Grant

• Current Assignee: SanDisk Technologies LLC (Western Digital Corporation)
• Original Assignee: Smart Storage Systems Incorporated (Western Digital Corporation)
• Inventors: Fitzpatrick, James, Rub, Bernardo, Dancho, Mark, Higgins, James, Jones, Ryan
• Granted Patent: US 9,021,231 B2
• Time in Patent Office: Days
• US Class Current: 711/173
• CPC Class Codes: G06F 11/3409 for performance assessment
• CPC Class Codes: G06F 11/3442 for planning or managing the needed capacity
• CPC Class Codes: G06F 11/3485 for I/O devices
• CPC Class Codes: G06F 12/0246 in block erasable memory, e.g. flash memory
• CPC Class Codes: G06F 2201/88 Monitoring involving counting
• CPC Class Codes: G06F 2212/1016 Performance improvement
• CPC Class Codes: G06F 2212/7204 Capacity control, e.g. partitioning, end-of-life degradation
• CPC Class Codes: G06F 2212/7208 Multiple device management, e.g. distributing data over multiple flash devices

Abstract

A method of operation of a storage control system includes: partitioning logical addresses into a number of subdrives, the logical addresses associated with a memory device; and monitoring a data write measure of one of the subdrives.

Claims

1. A method of operation of a storage control system comprising:

partitioning logical addresses into a number of subdrives, the logical addresses associated with a memory device; and

monitoring a data write measure of one of the subdrives.

2. The method as claimed in claim 1 further comprising assigning one of the logical addresses towards a most-written subdrive, the logical addresses are for writing by a host system.

3. The method as claimed in claim 1 further comprising assigning one of the logical addresses to a less-written subdrive when the one of the logical addresses is recycled.

4. The method as claimed in claim 1 further comprising calculating a subdrive over-provisioning capacity for one or more of the subdrives.

5. The method as claimed in claim 1 further comprising organizing a block of the one of the subdrives into a sparse pool based on a number of valid pages of the block.

6. A method of operation of a storage control system comprising:

partitioning logical addresses into a number of subdrives, the logical addresses associated with a memory device;

monitoring a data write measure of one of the subdrives; and

identifying a recommended subdrive based on the data write measure.

7. The method as claimed in claim 6 further comprising assigning one of the logical addresses towards a most-written subdrive when write data is written to the one of the logical addresses, the logical addresses are for writing by a host system.

8. The method as claimed in claim 6 further comprising assigning one of the logical addresses to a less-written subdrive when the one of the logical addresses is recycled.

9. The method as claimed in claim 6 further comprising calculating a subdrive over-provisioning capacity for one or more of the subdrives based on a subdrive logical capacity associated with the one of the subdrives.

10. The method as claimed in claim 6 further comprising organizing a block of the one of the subdrives into a sparse pool based on a number of valid pages of the block, the blocks selected based on a calculated reliability condition.

11. A storage control system comprising:

a subdrive assignment module for partitioning logical addresses into a number of subdrives, the logical addresses associated with a memory device; and

a data monitor module, coupled to the subdrive assignment module, for monitoring a data write measure of one of the subdrives.

12. The system as claimed in claim 11 wherein the subdrive assignment module is for assigning one of the logical addresses towards a most-written subdrive, the logical addresses are for writing by a host system.

13. The system as claimed in claim 11 wherein the subdrive assignment module is for assigning one of the logical addresses to a less-written subdrive when the one of the logical addresses is recycled.

14. The system as claimed in claim 11 further comprising an over-provisioning manager module, coupled to the data monitor module, for calculating a subdrive over-provisioning capacity for one or more of the subdrives.

15. The system as claimed in claim 11 further comprising an over-provisioning manager module, coupled to the data monitor module, for organizing a block of the one of the subdrives into a sparse pool based on a number of valid pages of the block.

16. The system as claimed in claim 11 further comprising an over-provisioning manager module, coupled to the data monitor module, for identifying a recommended subdrive based on the data write measure.

17. The system as claimed in claim 16 wherein the subdrive assignment module is for assigning one of the logical addresses towards a most-written subdrive when write data is written to the one of the logical addresses, the logical addresses are for writing by a host system.

18. The system as claimed in claim 16 wherein the subdrive assignment module is for assigning one of the logical addresses to a less-written subdrive when the one of the logical addresses is recycled.

19. The system as claimed in claim 16 wherein the over-provisioning manager module is for calculating a subdrive over-provisioning capacity for one or more of the subdrives based on a subdrive logical capacity associated with the one of the subdrives.

20. The system as claimed in claim 16 wherein the over-provisioning manager module is for organizing a block of the one of the subdrives into a sparse pool based on a number of valid pages of the block, the blocks selected based on a calculated reliability condition.