Delayed write failure logging
The present disclosure generally relates to a method and device for reduce the amount of energy used to revert data within a storage device to a consistent state after a power loss event. Once power is lost from a host device, and prior to complete shutdown, a log is created within non-volatile memory (NVM) of the storage device. The log contains logical block addresses (LBAs) corresponding to data that experienced a write failure. At the next power-on event, the log is checked to see if any LBAs are present. If LBAs are present in the log, then the data that experienced a write failure can be properly written to the storage device.
1. A storage device, comprising: a non-volatile memory; and a controller configured to, upon detection of a power loss event, write logical block address (LBA) ranges to a log stored in the non-volatile memory and to provide the log to a host device so that the host device has knowledge of delayed write failure and the LBA ranges stored in the log, and wherein the LBA ranges are associated with completed write commands not yet programmed to the non-volatile memory.
2. The storage device of claim 1 , further comprising a capacitor coupled to the controller.
3. The storage device of claim 1 , wherein the controller is configured to mark the LBA ranges as bad.
4. The storage device of claim 1 , wherein the controller is configured to detect the power loss event.
5. The storage device of claim 1 , wherein the controller is configured to enumerate all completed write commands in which data was not committed to the non-volatile memory.
6. The storage device of claim 1 , wherein the log is a single page.
7. The storage device of claim 1 , wherein the non-volatile memory is NAND.
8. The storage device of claim 1 , wherein the storage device is client grade SSD.
9. The storage device of claim 1 , wherein the controller is configured to:
read LBA ranges from the log, and wherein the log is a page that lists delayed write failures; and
provide the LBA ranges to a host device.
10. A storage device, comprising: a memory device; and a controller coupled to the memory device, wherein the controller is configured to: write logical block address (LBA) ranges to a log storage in the memory device upon detection of a power loss event; and provide the LBA ranges to a host device so that the host device has knowledge of delayed write failure and the LBA ranges stored in the log storage, and wherein the LBA ranges are associated with completed write commands not yet programmed to the memory device.
11. The storage device of claim 10 , further comprising a device to deliver power to the storage device after detection of the power loss event.
12. The storage device of claim 10 , further comprising a device to receive a power loss signal.
13. A storage device, comprising: at least one memory device containing a delayed write failure log page; and a controller coupled to the at least one memory device, the controller configured to: detect a power loss event;
enumerate all completed write commands in which data was not committed to the memory device; writing one or more logical block address (LBA) ranges to the delayed write failure log page, wherein the one or more LBA ranges correspond to the data associated with completed write commands that was not committed to the memory device; and deliver the one or more LBA ranges to a host device so that the host device has knowledge of delayed write failure and the one or more LBA ranges stored in the log.
14. The storage device of claim 13 , wherein the controller is further configured to:
power on the storage device; and
check the delayed write failure log page for one or more LBA ranges.
15. The storage device of claim 14 , wherein the controller is further configured to make the delayed write failure log page available to the host device.
16. The storage device of claim 14 , wherein the controller is further configured to receive the data that was not committed to the memory device from locations other than a host device, wherein the receiving occurs after powering up the storage device.
17. The storage device of claim 13 , wherein the controller is further configured to mark the one or more LBA ranges as bad in the delayed write failure log page.
18. The storage device of claim 17 , wherein the controller is further configured to communicate to the host device that the one or more LBA ranges are bad.
19. The storage device of claim 13 , wherein the memory device is NAND.
20. The storage device of claim 13 , wherein the controller is further configured to receive power from a capacitor after detecting the power loss event and prior to writing the LBA ranges to the delayed write failure log page.