Dislocated power loss protection charge storage

• US 10,346,072 B1
• Filed: 09/30/2016
• Issued: 07/09/2019
• Est. Priority Date: 09/30/2016
• Status: Active Grant

• Current Assignee: Amazon Technologies, Inc. (Amazon.com, Inc.)
• Original Assignee: Amazon Technologies, Inc. (Amazon.com, Inc.)
• Inventors: Peterson, Phillip, Wishman, Max Jesse, Watson, Christopher Nathan
• Primary Examiner(s): Chery, Mardochee
• Application Number:
  US15/281,816
• Time in Patent Office: 1,012 Days
• Field of Search: 711103
• CPC Class Codes: G06F 1/263 Arrangements for using multiple switchable power supplies, e.g. battery and AC G06F1/30 takes precedence
• CPC Class Codes: G06F 1/28 Supervision thereof, e.g. detecting power-supply failure by out of limits supervision
• CPC Class Codes: G06F 1/305 in the event of power-supply fluctuations
• CPC Class Codes: G06F 1/3225 of memory devices
• CPC Class Codes: G06F 1/3275 Power saving in memory, e.g. RAM, cache
• CPC Class Codes: G06F 1/3287 by switching off individual functional units in the computer system
• CPC Class Codes: G06F 3/0625 Power saving in storage systems
• CPC Class Codes: G06F 3/0634 by changing the state or mode of one or more devices
• CPC Class Codes: G06F 3/0659 Command handling arrangements, e.g. command buffers, queues, command scheduling
• CPC Class Codes: G06F 3/0679 Non-volatile semiconductor memory device, e.g. flash memory, one time programmable memory [OTP]
• CPC Class Codes: G11C 5/144 Detection of predetermined disconnection or reduction of power supply, e.g. power down or power standby

Abstract

Aspects of dislocated charge storage for power loss protection in non-volatile memory systems are described. A system includes a power supply having an output power stage with bulk capacitance to supply power for a period of time after a power supply failure. The system also includes a network storage interface device and a non-volatile memory media card both coupled to the power supply for power. The power supply is configured to generate a power loss alert in response to the power supply failure. In turn, the network storage interface device is configured to perform a power loss data protection procedure with the non-volatile memory media card based on the power loss alert and during the period of time that the bulk capacitance can supply power after the power supply failure. The additional capacitance typically needed for power loss protection features is located apart from the non-volatile memory media cards.

Claims

1. A system, comprising:

a power supply comprising a power supply controller and an output power stage having a bulk capacitance to supply power for at least a period of time after a power supply failure;

a network storage interface device coupled to the power supply for power and configured to receive data over a computer network for storage; and

a non-volatile memory media card coupled to the power supply for power, coupled to the network storage interface device over a backplane for data communications, and configured to perform a memory array access procedure based on a data access command from the network storage interface device, wherein;

the power supply controller is configured to generate a power loss alert in response to the power supply failure; and

the network storage interface device is configured, in response to the power loss alert, to;

halt the memory array access procedure;

develop a power loss protection data structure comprising indirection map metadata; and

communicate with the non-volatile memory media card to transfer the power loss protection data structure to a power loss protection memory area in the non-volatile memory media card during the period of time that the bulk capacitance can supply power after the power supply failure.

2. The system of claim 1, wherein:

the network storage interface device comprises a cache to store the data received over the computer network; and

the network storage interface device is further configured to;

communicate with the non-volatile memory media card during the memory array access procedure to transfer at least a portion of the data in the cache to a memory area in the non-volatile memory media card; and

communicate a halt command to the non-volatile memory media card to halt the memory array access procedure in response to the power loss alert.

3. The system of claim 2, wherein the network storage interface device is further configured, based on the power loss alert, to:

store the power loss protection data structure in the cache on the network storage interface device; and

communicate with the non-volatile memory media card to transfer the power loss protection data structure from the cache on the network storage interface device to the power loss protection memory area in the non-volatile memory media card.

4. The system of claim 1, wherein a processor in the network storage interface device comprises an input/output pin electrically coupled to an output of a power management bus of the power supply to receive the power loss alert.

5. A system, comprising:

a non-volatile memory media card coupled to a power supply for power; and

a network storage interface device coupled to the power supply for power, coupled to the non-volatile memory media card for data communications, and configured, in response to a power loss alert received from the power supply, to;

halt a memory array access procedure;

develop a power loss protection data structure comprising indirection map metadata; and

communicate with the non-volatile memory media card to transfer the power loss protection data structure to a power loss protection memory area in the non-volatile memory media card.

6. The system of claim 5, further comprising the power supply, the power supply comprising a power supply controller and an output power stage having a bulk capacitance to supply power to the non-volatile memory media card and the network storage interface device for at least a period of time after a power supply failure.

7. The system of claim 6, wherein the network storage interface device is configured to transfer the power loss protection data structure to the power loss protection memory area in the non-volatile memory media card during the period of time that the bulk capacitance can supply power after the power supply failure.

8. The system of claim 5, wherein the network storage interface device is further configured to:

receive a data transfer instruction and data over a computer network;

store the data in a cache on the network storage interface device; and

communicate with the non-volatile memory media card to transfer at least a portion of the data in the cache to a memory area in the non-volatile memory media card.

9. The system of claim 8, wherein, based on the power loss alert, the network storage interface device is further configured to communicate a halt command to the non-volatile memory media card to halt the memory array access procedure.

10. The system of claim 9, wherein, based on the power loss alert, the network storage interface device is further configured to:

store the power loss protection data structure in the cache on the network storage interface device; and

communicate with the non-volatile memory media card to transfer the power loss protection data structure from the cache on the network storage interface device to the power loss protection memory area in the non-volatile memory media card.

11. The system of claim 5, wherein:

the non-volatile memory media card comprises a plurality of non-volatile memory media cards; and

the network storage interface device is further configured, based on the power loss alert, to communicate a halt command to individual ones of the plurality of non-volatile memory media cards; and

communicate data to individual ones of the plurality of non-volatile memory media cards for storage in a power loss protection memory area in the individual ones of the plurality of non-volatile memory media cards.

12. The system of claim 11, further comprising a backplane between the network storage interface device and the plurality of non-volatile memory media cards.

13. The system of claim 5, wherein a processor in the network storage interface device comprises an input/output pin electrically coupled to an output of a power management bus of the power supply to receive the power loss alert.

14. The system of claim 5, wherein:

the power supply comprises a plurality of power supplies;

the system further comprises logic circuitry to combine an output from a power management bus of individual ones of the plurality of power supplies; and

a processor in the network storage interface device comprises an input/output pin electrically coupled to an output of the logic circuitry to receive the power loss alert.

15. A method, comprising:

receiving, by a processing device, a data transfer instruction and data over a computer network;

storing, by the processing device, the data in a cache based on the data transfer instruction;

translating, by the processing device, the data transfer instruction to a data access command for a non-volatile memory;

communicating, by the processing device, at least a portion of the data in the cache to a memory area in the non-volatile memory in a memory array access procedure using the data access command; and

in response to a power loss alert received from a power supply;

halting, by the processing device, the memory array access procedure;

developing, by the processing device, a power loss protection data structure comprising indirection map metadata; and

communicating, by the processing device, with the non-volatile memory to transfer the power loss protection data structure to a power loss protection memory area in the non-volatile memory during a period of time that a bulk capacitance in the power supply can supply power after receipt of the power loss alert.

16. The method of claim 15, wherein the power loss protection data structure further comprises logging data and data acknowledged by the processing device as being stored-complete.

17. The method of claim 16, wherein the communicating comprises communicating, by the processing device, the power loss protection data structure from the cache to the power loss protection memory area in the non-volatile memory.

18. The method of claim 15, wherein:

the non-volatile memory comprises a plurality of non-volatile memory media cards communicatively coupled to the processing device over a backplane; and

the method further comprises;

communicating, by the processing device, a halt command to individual ones of the plurality of non-volatile memory media cards; and

communicating, by the processing device, data to individual ones of the plurality of non-volatile memory media cards for storage in a power loss protection memory area in the individual ones of the plurality of non-volatile memory media cards.

19. The method of claim 15, wherein:

the power supply comprises a plurality of power supplies; and

the method further comprises combining an output from a power management bus of individual ones of the plurality of power supplies to generate the power loss alert.

20. The method of claim 15, wherein the processing device comprises an input/output pin electrically coupled to receive the power loss alert.