RESIZING NAMESPACES FOR STORAGE DEVICES

• US 20170351431A1
• Filed: 06/01/2016
• Published: 12/07/2017
• Est. Priority Date: 06/01/2016
• Status: Active Grant

• Current Assignee: Western Digital Technologies Incorporated (Western Digital Corporation)
• Original Assignee: Western Digital Technologies Incorporated (Western Digital Corporation)
• Inventors: Dewitt, Dylan Mark, Garg, Piyush
• Granted Patent: US 10,402,092 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 12/0238 Memory management in non-volatile memory, e.g. resistive RAM or ferroelectric memory
• CPC Class Codes: G06F 12/0284 Multiple user address space allocation, e.g. using different base addresses interprocessor communication G06F15/163
• CPC Class Codes: G06F 12/0292 using tables or multilevel address translation means G06F12/023 takes precedence; address translation in virtual memory systems G06F12/10
• CPC Class Codes: G06F 2212/1032 Reliability improvement, data loss prevention, degraded operation etc
• CPC Class Codes: G06F 2212/651 Multi-level translation tables
• CPC Class Codes: G06F 2212/657 Virtual address space management
• CPC Class Codes: G06F 2212/7201 Logical to physical mapping or translation of blocks or pages
• CPC Class Codes: G06F 2212/7205 Cleaning, compaction, garbage collection, erase control
• CPC Class Codes: G06F 2212/7206 Reconfiguration of flash memory system
• CPC Class Codes: G06F 3/0605 by facilitating the interaction with a user or administrator
• CPC Class Codes: G06F 3/0619 in relation to data integrity, e.g. data losses, bit errors
• CPC Class Codes: G06F 3/0631 by allocating resources to storage systems
• CPC Class Codes: G06F 3/064 Management of blocks
• CPC Class Codes: G06F 3/0659 Command handling arrangements, e.g. command buffers, queues, command scheduling
• CPC Class Codes: G06F 3/0665 at area level, e.g. provisioning of virtual or logical volumes
• CPC Class Codes: G06F 3/0673 Single storage device
• CPC Class Codes: G06F 3/0679 Non-volatile semiconductor memory device, e.g. flash memory, one time programmable memory [OTP]

Abstract

A method may include receiving, by a controller of a storage device and from a host device, a command to resize a first namespace of a plurality of namespaces stored in a non-volatile memory device of the storage device. The method may further include, relocating, by the controller, a physical block address for the non-volatile memory device from an entry in a virtual to physical table identified by a first index value to an entry in the virtual to physical table identified by a second index value, and in response to relocating the physical block address, updating, by the controller, a mapping, by a namespace table, to indicate an initial index value of a second namespace of the plurality of namespaces.

Claims

1. A method comprising:

receiving, by a controller of a storage device and from a host device, a command to resize a first namespace of a plurality of namespaces stored in a non-volatile memory device of the storage device; and

in response to receiving the command to resize the first namespace;

relocating, by the controller, a physical block address for the non-volatile memory device from an entry in a virtual to physical table identified by a first index value to an entry in the virtual to physical table identified by a second index value; and

in response to relocating the physical block address, updating, by the controller, a mapping, by a namespace table, to indicate an initial index value of a second namespace of the plurality of namespaces.

2. The method according to claim 1, wherein:

the first namespace is associated with a first set of contiguous index values of the virtual to physical table; and

the second namespace is associated with a second set of contiguous index values of the virtual to physical table, the second set of contiguous index values starting with the initial index value indicated by the second table after relocating the physical block address.

3. The method according to claim 2, wherein:

the command to resize indicates adding a quantity of physical block addresses to the first set of contiguous index values for the first namespace, and

relocating the physical block address comprises moving the second set of contiguous index values for the second namespace within the virtual to physical table away from the first contiguous index values to permit adding the quantity of physical block addresses to the first set of contiguous index values for the first namespace.

4. The method according to claim 3, comprising:

determining, by the controller, whether one or more intermediate index values in the virtual to physical table permit adding the quantity of physical block addresses to the first set of contiguous index values for the first namespace,

wherein the one or more intermediate index values are positioned between the first set of contiguous index values and the second set of contiguous index values, and

wherein relocating the physical block address is in response to determining that the one or more intermediate index values in the virtual to physical table do not permit adding the quantity of physical block addresses to the first set of contiguous index values for the first namespace.

5. The method according to claim 2, wherein:

the command to resize indicates reducing a quantity of physical block addresses of the first set of contiguous index values for the first namespace, and

relocating the physical block address comprises moving the second set of contiguous index values for the second namespace within the virtual to physical table towards the first contiguous index values.

6. The method according to claim 2, wherein relocating the physical block address comprises:

moving, by the controller, the second set of contiguous index values for the second namespace within the virtual to physical table from a corresponding set of index values of the virtual to physical table to another corresponding set of index values of the virtual to physical table; and

preventing, by the controller, access to read and write to the second namespace while moving the second set of contiguous index values for the second namespace within the virtual to physical table.

7. The method according to claim 1, wherein data stored at a physical block address of the non-volatile memory device of the storage device includes a tag indicating a namespace identifier and an offset, the method further comprising:

determining, by the controller, an index value of the virtual to physical table corresponding with the physical block address by;

determining, by the controller, a base index value for the physical block address using the namespace table and the namespace identifier indicated in the tag; and

adding, by the controller, the offset to the base index value.

8. The method according to claim 1, wherein:

the virtual to physical table is stored in a first memory of the controller,

the namespace table is stored in a second memory of the controller, and

the second memory of the controller has a faster input/output speed than the first memory.

9. A storage device comprising:

a storage element; and

a controller configured to;

receive, from a host device, a command to resize a first namespace of a plurality of namespaces stored in a non-volatile memory device of the storage device; and

in response to receiving the command to resize the first namespace;

relocate a physical block address for the non-volatile memory device from an entry in a virtual to physical table identified by a first index value to an entry in the virtual to physical table identified by a second index value; and

in response to relocating the physical block address, update a mapping, by a namespace table, to indicate an initial index value of a second namespace of the plurality of namespaces.

10. The storage device of claim 9, wherein:

the first namespace is associated with a first set of contiguous index values of the virtual to physical table; and

the second namespace is associated with a second set of contiguous index values of the virtual to physical table, the second set of contiguous index values starting with the initial index value indicated by the second table after relocating the physical block address.

11. The storage device of claim 10, wherein:

the command to resize indicates adding a quantity of physical block addresses to the first set of contiguous index values for the first namespace, and

the controller is further configured to move the second set of contiguous index values for the second namespace within the virtual to physical table away from the first contiguous index values to permit adding the quantity of physical block addresses to the first set of contiguous index values for the first namespace.

12. The storage device of claim 11, wherein:

the controller is further configured to determine whether one or more intermediate index values in the virtual to physical table permit adding the quantity of physical block addresses to the first set of contiguous index values for the first namespace,

the one or more intermediate index values are positioned between the first set of contiguous index values and the second set of contiguous index values, and

relocating the physical block address is in response to determining that the one or more intermediate index values in the virtual to physical table do not permit adding the quantity of physical block addresses to the first set of contiguous index values for the first namespace.

13. The storage device of claim 10, wherein:

the command to resize indicates reducing a quantity of physical block addresses of the first set of contiguous index values for the first namespace, and

the controller is further configured to move the second set of contiguous index values for the second namespace within the virtual to physical table towards the first contiguous index values.

14. The storage device of claim 10, wherein the controller is further configured to:

move the second set of contiguous index values for the second namespace within the virtual to physical table from a corresponding set of index values of the virtual to physical table to another corresponding set of index values of the virtual to physical table; and

prevent access to read and write to the second namespace while moving the second set of contiguous index values for the second namespace within the virtual to physical table.

15. The storage device of claim 9, wherein:

data stored at a physical block address of the non-volatile memory device of the storage device includes a tag indicating a namespace identifier and an offset, and

the controller is further configured to;

determine an initial index value for the physical block address using the namespace table and the namespace identifier indicated in the tag; and

add the offset to the initial index value to determine an index value of the virtual to physical table corresponding with the physical block address.

16. The storage device of claim 9, wherein:

the virtual to physical table is stored in a first memory of the controller,

the namespace table is stored in a second memory of the controller, and

the second memory of the controller has a faster input/output speed than the first memory.

17. A non-transitory computer-readable storage medium encoded with instructions that, when executed, cause one or more processors of a storage device to:

receive, from a host device, a command to resize a first namespace of a plurality of namespaces stored in a non-volatile memory device of the storage device; and

in response to receiving the command to resize the first namespace;

relocate a physical block address for the non-volatile memory device from an entry in a virtual to physical table identified by a first index value to an entry in the virtual to physical table identified by a second index value; and

in response to relocating the physical block address, update a mapping, by a namespace table, to indicate an initial index value of a second namespace of the plurality of namespaces.

18. The non-transitory computer-readable storage medium of claim 17, wherein:

the first namespace is associated with a first set of contiguous index values of the virtual to physical table; and

the second namespace is associated with a second set of contiguous index values of the virtual to physical table, the second set of contiguous index values starting with the initial index value indicated by the second table after relocating the physical block address.

19. A system comprising:

means for receiving, from a host device, a command to resize a first namespace of a plurality of namespaces stored in a non-volatile memory device of the storage device;

means for relocating a physical block address for the non-volatile memory device from an entry in a virtual to physical table identified by a first index value to an entry in the virtual to physical table identified by a second index value; and

means for updating a mapping, by a namespace table, to indicate an initial index value of a second namespace of the plurality of namespaces in response to relocating the physical block address.

20. The system of claim 19, further comprising:

means for preventing access to read and write to the second namespace while relocating the physical block address.